The reporter has no clue how electricity works. Electricity does not “seep into” water. Bodies of water ARE grounded.
The problem is that the dock (must have been metal) was electrified and not grounded. Current flowed through the victims when they were touching both the dock and the water.
What every boater needs to know about Electric Shock Drowning.
http://www.boatus.com/seaworthy/magazine/2013/july/electric-shock-drowning-explained.asp