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Taiwanese Navy detected an unidentified submarine outside one of its major naval bases
Looks like the Chinese aren't to good in Hidding that fact
The natural enemy of submarines are stray fishing nets. Once tangled in their propeller, the boat is pretty paralyzed, and all it can do is surface, and hope that somehow the netting can be cleared, and that it hasn’t done too much damage.
The trick is to have some stray fishing nets in the path of where the enemy submarines are lurking.