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But... that's not a boat. Shouldn't it be Subby McSubface?

It's the remotely controlled support vehicle.

Remotey Remoteface?

Droney McDroneface?

Subs are boats.

They're subnautical vehicles. They're beneath that.

The German name, "Unterseeboat", and the English adaptation, "U-boat" both imply that they are a type of boat.

I'm starting to suspect some dark humour here. But it runs silent, runs deep. And seems to have gotten all wet.