The trivial solution would be a cavity filled with water same shape and size as the submarine, at the same position as the submarine.
Why is this marked interesting? Clearly it's funny, since the above suggestion is to have the so-called submarine actually just be a pocket of water. i.e. no submarine.
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The trivial solution would be a cavity filled with water same shape and size as the submarine, at the same position as the submarine.
Why is this marked interesting? Clearly it's funny, since the above suggestion is to have the so-called submarine actually just be a pocket of water. i.e. no submarine.