Electrocution in rubber swimming pool?
I wouldn't get into that pool, but this isn't as bad as it might first appear:

If the rubber is intact, then there is no path to ground.  Electricity can only flow between the two conductors.  There would be a strong field between them, but that would diminish rapidly with distance.  The remaining currents thru the water (and you) a foot away from two conductors spaced normal outlet distance apart should be pretty negligeable.

The real issue is leakage from the hot side thru the water to some ground connection.  In this pool, it appears that would only be due to a pinhole leak in the pool floor (presumably a bigger opening would be found and fixed to prevent water loss).  That would be some distance from where the power cord touched the water, which should be a significant resistance.  For the current to be substantial, the distance would have to be close, making it less likely your body is near any significant current path.  For longer distances, the current would be less due to the resistance, and more spread out anyway.

Since the most serious danger is from hot to ground conduction, a ground fault interruptor should shut off the power feed if there was such condution.  Of course anyone dumb enough to float a outlet strip in a pool, and then get into the pool, probably didn't think of plugging the thing into a GFI circuit.

What's the real problem here?  We've got 7G people on this planet and rising.  If some of them want to do the rest of us a favor in reducing this problem, who are we to object?  I'm all for Darwin Awards as long as I don't get one.