Beach worms??

i was at the beach today and i looked in the water where it was recedeing from a wave, and i saw hundreds of small worms!! what are they? and are they harmful? what do they feed off of?

usually the problem is flies.
worms are food for fish, its safe to swim with them but be careful from the pollution that attract them usually
I don't know,but note to self never go in water at beach.

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