I worked for the power company and got called in years ago to kill the power and pump an entire basement of a bank. The 2 "sprinkler system broke and flooded the basement. The water was so clear and high it was half way up the stairs and people walked down the stairs into the water without paying attention. They were lucky we got the power off before they entered the water and got killed. Even with the water turned off it took us over 6 hours to get the basement pumped.

Mike