"Debris field" found near Titanic in search for missing sub, U.S. Coast Guard says
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The sub went missing while carrying five people to the wreckage of the Titanic.
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If you want to command something in the water, you run a wire from that something to a receiver in the cabin.
Right, exactly. Or for a "sub" that only holds 5 people... maybe just spend the 10 cents and wire it lol.
I mean, the sub had reached Titanic several times, right?
So even without the design documents, we know it was previously capable of operating at depth.
Which we means we know the hull wasn't made of cotton candy, we know it wasn't propelled under water by an internal combustion engine, and we know it wasn't controlled by a device that stops working in water.