Found on YouTube, this is the compensation chamber of a hydro-electric power station, demonstrating its operation when the turbines are slowed to 15% capacity as a test. The room starts to flood just after 45 seconds, and the water ends up 2m deep before draining away again in an enormous whirlpool.
I can't help thinking it would be awesome to be sitting on the concrete steps on the lower right as the water comes in, and feeling it rise up and soak your clothes as it happens. Have to be very careful not to get sucked into the vortex of the exiting water when the flow resumes though!
Love you, too
