It makes it worse... but there isn't anyone that can swim long fully clothed without a lot of survival training. It becomes serious really fast no matter what.
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>>but there isn't anyone that can swim long fully clothed without a lot of survival training<<
It isn't that tough as long as you don't panic, which is what kills virtually everyone in the water. Anyone can drownproof fully clothed for days if they need to. Bob up and down in the water, relax to go down, one stroke to come up for air, and you will die of thirst before you get tired.
I think what happened was people got caught under the boat and paniced. The thing is, as soon as you see the boat going down, you must get into the water.