>>25613287
>>25613307
It doesn't sound like a crack or a leak, but like they left a valve open while refilling the tank and let water out.
100m3 is a lot of water, but they said it happened during refilling of the tank, not that it occasioned refilling the tank. I mean, it could be a leak and they're just lying, but that's not suggested by what they did say. If it happens again, or continues, then that would suggest a leak.