I see all over the net (eg, here: http://www.lightningsafety.com/nlsi_pls/swimming_pools.html) that lightning and pools are a dangerous combination, but I can find NO reports of actual deaths from lightning hitting a pool and killing the swimmers.
Is this an urban legend?
Nobody actually died, but lightning did strike the pool.
Also, not everything is on the Internet.
Is lightning unlikely to hit a pool because, perhaps, there are usually fences and other higher metallic objects around?