The typical jewish response is “it was a water reservoir for fires”, but here’s the thing, you wouldn’t have starting blocks & diving boards on a “water reservoir.”
Source: https://x.com/WeimarWorlds/status/2030870520598548718
The hoax of the twentieth century : the case against the presumed extermination of European Jewry
https://archive.org/details/hoaxoftwentiethc0000butz
https://web.archive.org/web/20130127004643/http://www.geniebusters.org/915/04g_gas.html