Well, we had pictures very quickly of the OVH fire. Google seems to be not very transparent on what is exactly happening...
The linked article says that there was a leak in a water cooling system, which in turn ended up in the battery system which caused a fire. But yeah it’s not coming from Google but second hand reports.
It's not second hand, it's from the colo provider they're using in Paris.
If you trench a fire in water in a DC it might be just as bad.