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and developed economies depend on them

is the second most severe conservation status for wild populations in the IUCN's schema after Critically Endangered (CR)

Submarine Transportation Ocean Marine Serie Set Mint NH pilot Mozambique African Nature Zebra LakeComoros Submarine Transportation Ocean Marine Serie Set Mint NH A submarine (or simply sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term most commonly refers to a large, crewed vessel. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium sized or smaller vessels, such as the midget