Corrected entry: In the scene where the guy gets electrocuted on the antenna, this would not happen. 1)The power would have shorted out long before the water got to the transformer 2) the guy would not have gotten shocked even if the water was electrified because he was not grounded. The water would have taken the electricity to the true earth ground immediately as electricity ALWAYS takes the past of least resistance.
Corrected entry: There's are several scenes where Christian Slater is shown below water-surface and the water is always clear as crystal, like in a swimmingpool. I've once experienced a flood in Poland myself. If there's a flood, the water is always filthy and dirty. You can't see an inch under water.