There's no reason to fear a typical deep one. The worst depiction of deep ones is as stupid animal male feminists in neonomicon. That's not what they're like at all. The average deep One is smarter than a human, but is a harmless eccentric who wants to pursue his or her studies and craft in peace. He also has been doing this long enough that the average deep one sculptor makes Michaelangelo seem like a talented amateur who might amount to something in a couple of centuries of apprenticeship.
That's not who's going to be chasing you around a lighthouse, however. The Deep ones are a race on the verge of extinction and, to some, this is intolerable. There aren't deep one nations anymore, but only isolated city-states. Outbreeding with unrelated species, such as humans, sharks, and whales, is just a desperate attempt to stave off the inevitable end. This doesn't bother the typical deep one because they're immortal and so they don't see what all the fuss about since most of their ancestors eight generations back are still alive and fine, but certain fanatics see the passing of the great race and will do anything to bring about it's return or drag humanity down with them.
A deep one isn't the creature from the black lagoon: it's the creature from the black lagoon as a dangerous psychic sorcerer-scientist with a chip on their shoulder and a well-deserved sense of racial superiority over the stupid prairie apes, a biongeneered body far superior to a human, and all the bitterness of a fallen empire, a decayed and degenerate culture, and a species nearing extinction.
In a straight-up fight a human with a gun can kill an unarmed deep one fairly easily, but that's why they never engage in a straight-up fight. They're smarter than the players and respect humans just enough to make their hatred personal.
Also they know a method for drowning a human that takes nine agonizing hours.
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In COC knowledge itself is often dangerous and hateful. The deep one's know of the true nature of the world.
The deep ones know that Cthulhu's victory is inevitable and they can't stop him.
The stars will eventual be right and
That's not just a bad future. That's the inevitable future. You can kill cthulhu with an atomic bomb, mustard gas, or a boat's prow, but
And with strange aeons even death may die.
Eventually all that you love and care for about humanity will be burnt away. And what is left will join great Cthulhu in dancing in the ruins of human civilization. They will be as children: joyful and innocent and heartless.
And the deep ones will join in this madness and wipe away the degenerative mockery of what was once humanity because the alternative is be destroyed. This is the future.It cannot be stopped; it can only be delayed.
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Cthulhu has never been killed with a nuclear weapon, so I'm skeptical it wouldn't work just because he said it won't.
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He'll be dead but he won't stay dead. You just bought humanity another few centuries
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Doesn't Russia
have at least 135? Just keep nuking him until we make quantum weapons 
that make killing 
Cthulhu 
just another regular 
thing like changing the clocks at Daylight Savings. Then what when we're all dead and gone, who kills Cthuhlu. Nobody, he wins and his prize 
is one last giant 
meme laser-etched into the planet 
visible in space:
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Eventually humanity will embrace cthulhu because he offers awesome toys and freaky powers.
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I should
become immortal 
because I can be a contrarian 
just for shits and grins. I'll press 
the kill button 
every 100k years.
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Enough time to invent an automated assfricking prison for him. Out in space, super science steel box (Cthulhu brain wave resistant) with a big dildo reared up his butt, he just sits in there getting his butt fricked till he's rehabilitated.
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Nagative. It's only a matter
of time before 
someone makes 8.6Blk Ratshot and with autism 
evolving, that time is near.
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