Action taken against alleged drones over Volkel air base (the Netherlands)

Near the end there (the 2200Z file) they say the first report was "around half past seven", but the first mention of drone activity was at 6.41pm local time according to the first clip (1730Z file).
I think the AI translation failed here. I think they say in Dutch 'rond half zeven' (half seven) and 'half elf' (half eleven) which seems to be the idiomatic way to say 6:30 and 10:30, respectively (which aligns with the timing of concrete events in the transcript), but the whisper model interpreted those spoken times as half past 7 and half past eleven, 7:30 and 11:30.

I wonder if there's a way to keep the transcription to the original spoken language. I want a single whisper model run to transcribe both English and Dutch. But not also translate the Dutch to English at the same time.
 
Just to confirm, if whisperX uses the Dutch-specific alignment model, from timestamps 19:15 to 19:45 in the 2200Z liveatc recording, it comes out in Dutch correctly:

EHEH7-Gnd-Nov-22-2025-2200Z.1915.1945.m4a-transcripts/EHEH7-Gnd-Nov-22-2025-2200Z.1915.1945.vtt
WEBVTT

00:00.149 --> 00:01.870
Goed je te horen.

00:01.891 --> 00:02.711
Ja, eentje gelijk.

00:02.751 --> 00:04.493
Fijn dat jullie weer terug zijn.

00:04.513 --> 00:06.975
Nou, we zijn dan blij dat jullie weer terug kunnen komen.

00:07.175 --> 00:09.497
Want hoe lang heb je nou last gehad van die dingen?

00:09.517 --> 00:11.559
Ja, rond half zeven kregen we de eerste melding.

00:11.599 --> 00:19.446
En ik denk dat, ja, een uurtje zijn we nu half tien... Nee, half elf gingen we ongeveer weer open.

00:19.466 --> 00:20.627
Goed dat je überhaupt weer open ging.

00:20.647 --> 00:23.609
Want op een gegeven moment was ik niet meer zeker of dat nou wel zou lukken.

00:23.649 --> 00:28.073
En zijn ze er zelf weggegaan of mag je er niets over zeggen?

00:28.093 --> 00:30.055
Nou, we hebben hier een...


Claude translates those two lines:
00:09.517 --> 00:11.559
Yeah, around half past six we got the first report.

00:11.599 --> 00:19.446
And I think, yeah, about an hour we're now half past nine... No, around half past ten we opened again.

The AI needs more Dutch trainers.. :)
I think the issue is trying to mix audio from different languages. With text, the mainstream AIs seem to have no problem. And the Dutch audio model worked fine on this segment. And then a general purpose text model worked fine at interpreting those Dutch times as meaning 6:30 and 10:30. Like, general-purpose Claude did the text translation from Dutch to English correctly. But maybe the whisper audio model is missing the context that "half seven" in Dutch means 6:30. It also seems to be missing words. Like, overlooking actual errors, the English mode is outputting the gist of what was said in Dutch, but not exactly.

So it really needs to be two steps, transcribing in the original spoken language using a language-specific audio model, and then translating the written language using a different model (and a general purpose text model is probably fine). But I really don't want to run it all twice and then try to merge the transcripts, because it's compute-intensive enough as it is to do multi hour transcripts and would be hard to tell which sections were in which language originally. I'm not sure there's a free easy-to-use tool right now that will try to isolate each sentence from the audio, prior to knowing the language, detect each sentence's language, and then transcribe each independently using a language-specific model.
 
The AI needs more Dutch trainers.. :)
It's not just Dutch, the "half X" = "half of the way to X" rather than "half of the way past X" is extremely common. So much so I'd claim it's not even idiomatic: "half" is always a "less than". Dropping the "past" is clearly an elision too far in English, and has created the idiomatic expression.
 
It's not just Dutch, the "half X" = "half of the way to X" rather than "half of the way past X" is extremely common. So much so I'd claim it's not even idiomatic: "half" is always a "less than". Dropping the "past" is clearly an elision too far in English, and has created the idiomatic expression.
I can confirm that It's the same in Norway, as in "half 7" = 6:30, there.
 
No wonder everybody has trouble dealing with local vs. UTC -- even if you get THAT right, you have all this half-time stuff to flummox you!
 
Yes, in British English "half six" (etc) is a very common shorthand for "half past six". Unlike in many European languages where it means "halfway to six", in other words half past five.
 
From own observation,
Last evening 4-12-2025 around 17:00 local time STAB1 (AH-64, no ADSB) operated over Volkel Airbase and was searching for 'air objects near the field'.
STAB1 returned to Gilze-Rijen Airbase around 20:30 local time for a hot refuel. No deployment after that.

Since they were working with Bandbox CRC (Air Operations Control Station Nieuw Milligen / Dutch Air Defence) this was no regular exercise mission.
 
For sure an interesting twist:

(source: Dronewatch NL & Trouw - behind paywall)

Dronewatch article translated below:

Drone reports over Volkel and Eindhoven: detection missing, evidence remains lacking

Statements by outgoing State Secretary of Defense Gijs Tuinman in an interview with Trouw shed new light on the drone incidents over the Volkel and Eindhoven military airfields in November. According to Tuinman, the Ministry of Defense was unable to detect the alleged drones with specialized radars at the time, because these systems had been loaned to Ukraine. As a result, the sightings over Dutch territory were made exclusively with the naked eye, and there is currently no hard technical confirmation.

Drone radars were loaned

In the interview with Trouw, Tuinman confirms that the Netherlands has IRIS systems, micro-Doppler radars specifically developed to detect drones based on their rapidly rotating propellers. This Dutch technology can distinguish between drones, birds, and other objects in the airspace. However, during the incidents at Volkel and Eindhoven, these drone radars were not present in the Netherlands because they were deployed in Ukraine.

This meant that the Ministry of Defence could not rely on specialized drone detection for the reports above the airfields, but only on visual observations by military personnel. This left it unclear whether drones were actually flying, and if so, what type. Tuinman emphasizes that the drones were indeed observed and that shots were fired at.

Investigation ongoing

Tuinman states in the interview that the incidents are being investigated by the Public Prosecution Service in collaboration with security services. So far, the results of that investigation have not been made public. Whether that will happen is uncertain. To date, the Ministry of Defence has been very reluctant to share information about detection equipment and operational analyses.

This reluctance is not unique to the Netherlands. In other European countries, including Belgium and Denmark, investigations into similar drone incursions have not yet been completed, let alone publicly shared. As a result, in many cases, concrete evidence that drones were actually active is still lacking. Let alone that the operator has been identified or that a firm link to Russia can be established.

Purchases after the incidents

According to Tuinman, the incidents highlight the constant need to make choices between deploying resources in Ukraine and protecting critical infrastructure domestically. It recently became clear that, in response to the events, the Ministry of Defence has accelerated the purchase of additional detection systems. This includes IRIS radar solutions.
 
Some more follow-up about the alleged drone sightings at Volkel airbase and Eindhoven airport, on Nov 21&22 2025 (source: Dronewatch.nl and Trouw), machine translated to English:



Investigation into Night-Time Drones Near Volkel and Eindhoven Yields No Results

Night-time reports of unidentified drones near Volkel Air Base and Eindhoven Airport caused significant unrest late last year. Air traffic was temporarily halted, Defence deployed anti-drone weapons, and substantial investments in detection systems and counter-drone measures were announced shortly afterwards. Despite this, the investigation into the incidents on 21 and 22 November has so far produced no concrete results. No drones have been found, no suspects identified, and no criminal investigation has been launched. This was reported by Trouw, based on information from the Royal Netherlands Marechaussee.

No suspects, no evidence

According to a spokesperson for the Marechaussee, the reports around Volkel and Eindhoven did not lead to the identification of a suspect and provided no grounds for a criminal investigation. No drones or drone components were recovered. All reports are, however, systematically recorded and analysed to enable faster and more targeted responses to future incidents, the Marechaussee told Trouw.

Notably, the threat was taken seriously at the time. Eindhoven Airport was closed for several hours and anti-drone weapons were even deployed at Volkel. At a later stage, State Secretary Gijs Tuinman referred to hobby drones, possibly operated by "mischievous youngsters".

Part of a European 'drone panic'

The Dutch incidents are not isolated. In the second half of 2025, air traffic at several European airports was disrupted following mostly night-time sightings of suspected drones. Military bases were also affected. Various politicians openly speculated about Russian espionage or sabotage.

However, an analysis of more than sixty incidents by Trouw and Dronewatch showed that hard evidence was almost always lacking. In many cases, it remained unclear whether drones had actually been flying at all. On multiple occasions, stars, helicopters or aircraft were mistaken for drones. A similar episode of 'drone panic' based on incorrect observations occurred in late 2024 in the US state of New Jersey.

Human observation at the core

In the cases of Volkel and Eindhoven, the Marechaussee maintains that drones did fly in late November. This conclusion is based on human observations, in some cases supported by photos and videos. This material has not been made public. At the end of December it emerged that the IRIS drone radars, which might have been able to detect the drones, were on loan to Ukraine at the time of the sightings.

In recent months, rapidly procured detection equipment has been installed at airports and military bases. Since then, large-scale disruptions have not occurred. In recent weeks, however, several drones were observed during daytime near Volkel, Eindhoven and Gilze-Rijen, leading to a number of seizures.
 
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And now things are really getting weird. Dutch newspaper The Stentor just published this story about alleged drones above a gas distribution station near the city Ommen, on November 21, 2025 (same night as the Volkel drone sightings). So we have nightly sightings of multiple drones at two different locations, situated more than 100 km from each other. It was partly cloudy that day. Could we have a Starlink train mistaken for drone swarms?



Multiple drones flying over the largest gas site in the Netherlands

Several drones were spotted over the largest gas site in the Netherlands at the end of last year. It now appears that several people in Ommen called 112. The incident was kept quiet. And that has led to outrage. "This is a serious location."

It is the evening of Friday, November 21, 2025. Several Ommen residents call 112. Their reports of three drones over Vilsteren prompt the police and the IJsselland Safety Region to take action.

In vain. The flying objects disappear in the darkness of the autumn night.

Drones are spotted at several strategic locations in the Netherlands and Belgium during the same period. Airports in Eindhoven, Liège, Charleroi, and Volkel are being plagued by the devices.

It's causing outrage and sparking discussions in the National Security Council.

Alarm bells are also ringing in Ommen, confirms Mayor Hans Vroomen. He will be informed later that evening. He is the portfolio holder for public order and safety. But in the interest of maintaining the peace of Ommen, he's keeping quiet.

Largest in the Netherlands

Gasunie is a vulnerable location in the municipality. The distribution station in Vilsteren, along with Ravenstein, is the largest gas facility in the Netherlands. Almost all of the country's gas passes through this pipeline junction.

"An important location for our country. If a bomb falls there, I don't think my house in Ommen will still be standing," LPO parliamentary group leader Ron de Wit emphasizes the seriousness of the incident.

He's not alone. "If this whole thing explodes here, the windows will be blown out all the way to Utrecht," says neighbor Joke van de Crommert. The owner of cheese farm De Heileuver remains level-headed despite the visits from flying objects. "I don't panic easily."

A little further on, a farmer is less reassured. He wishes to remain anonymous. "I find it strange that we haven't heard anything from the authorities."

Especially in the fall, news programs frequently report on unknown drone visits, says the farmer. "As a citizen, I have the right to know that strange drones have been flying around my house. Yes, this does frighten me. This is a serious location."

In 1972, the Gasunie plant in Vilsteren was already the target of a (failed) bomb attack. Spokesperson Michiel Bal declines to comment on whether it is a frequent target of drones.

He also declines to comment on tightened measures around this Ommen location. "We are cautious about our security."

Politics raises the alarm

The People's Party Ommen Vooruit (VOV) raised the alarm with Mayor Vroomen shortly before Christmas. In a public council meeting, he has to explain why the drones remained hidden from the public. He argues about safety. And the police's responsibility.

That's too easy for politicians. "If we hadn't asked questions, everything would still be secret," says VOV party leader Bas van der Velde.

"It's about the safety of your residents. If there's a threat, it shouldn't be swept under the rug."

And politicians have a right to openness. "A mayor can also tell us things in confidence," says CDA politician Erik Veurink. "Ultimately, he makes the decision. But all things considered, we should definitely have been informed."

Van der Velde and De Wit emphasize this. "As politicians in Ommen, we talk a lot about transparency," says the LPO member. "The newspapers are full of locations where drones have been spotted, but Ommen decides not to release anything. It's a shame."

Van der Velde (VOV): "As a council, we are the highest authority in Ommen. An extension of society. Therefore, I find it incomprehensible that information is being withheld."

Political balancing act

Vroomen acknowledges the crucial role of the heavily secured Gasunie site. With a separate disaster response plan.

"This is a police matter," says Vroomen's spokesperson. "It's not customary for a mayor to also inform the council."

The impossible balancing act between transparency and safety, says council faction leader Roosmarijn Wernars (D66). "I'm also in favor of openness. But in this case, the mayor and the police decided not to stoke fear. They wanted to keep the situation manageable."

Professionals or hobbyists? Even two months after the incident, the police still have no idea who is behind the drone visits, says spokesperson Suzan Scholten. She denies that the police deliberately concealed the drone issue. "The police do not send out a report for every incident."
 
And now things are really getting weird. Dutch newspaper The Stentor just published this story about alleged drones above a gas distribution station near the city Ommen, on November 21, 2025 (same night as the Volkel drone sightings). So we have nightly sightings of multiple drones at two different locations, situated more than 100 km from each other. It was partly cloudy that day. Could we have a Starlink train mistaken for drone swarms?
Are there any actual reports of videos with exact date, time, location, and direction?
 
Hi @wdejager, do you know if that line means that drones were actually confiscated by police?
If so, is there any further information?
Yeah, some drone pilots were caught flying a drone illegally during the daytime, in the past few weeks. This happened near Volkel, Eindhoven, and Gilze-Rijen. In the case of Volkel, it seems that the drone pilot was just making some video footage of a nearby building, nothing suspicious really.

The fact that drone pilots are getting caught is probably a direct result of the installation of more drone detection capacity at those sites since the drone panic.

Here's some more info: https://www.dronewatch.nl/2026/01/2...genomen-bij-eindhoven-airport-en-gilze-rijen/
 
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