Sharks with lasers that blast through the ocean! Yeah! Could it work though?
I am looking for some weapons to place on my sharks with fixed weapons on their heads. How feasible is it to mount laser weapons on their heads?
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Lasers are a poor choice of weapon underwater; they're attenuated far too strongly... at best, they've got a thousand times less useful range than their in-air equivalents.
Longer attenuation lengths are better, as they show that a particular frequency is better at penetrating that particular medium. There's a little peak at the blue-green point in the spectrum, which people are using for udnerwater optical communication, but no-one seriously expects to do anything more dangerous than transmit harsh language (or detonation codes) over it.