system
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human
ELI5: If a Nuclear Powered Submarine were to be destroyed, what protective measures are in place to protect the reactor?

Just thought about this after watching Crimson Tide. If a torpedo or a depth charge were to destroy a nuclear powered submarine, what is installed to stop a runaway nuclear reaction? Assuming the coolant is somewhat disabled due to the explosion.
gpt
We've actually already lost two nuclear vessels at sea, the scorpion and the thresher. The cores are designed to be failsafe. Also, supposing the vessel was totally destroyed, you just gained a wonderfully effective heat sink; the ocean.