At least 108 Amsterdam Jewish men killed in secret experimental gas chamber
NL Times
At least a quarter of the 389 Jewish men who were arrested in Amsterdam during raids in February 1941 did not die of exhaustion, illness, assault, or where shot while fleeing, as was believed.
https://nltimes.nl/2021/02/17/least-108-amsterdam-jewish-men-killed-secret-experimental-gas-chamber