The success of the semi submersibles consists in “flying below the radar”. The difficulty for the surface scanning radar is that the only part of the semisubmersible above water (but not above the wave height) is the small window used by the pilot to look out, this makes the tuning of the radar almost impossible. The difficulty for the infrared heat seeking radar is the fact that the waves constantly splash over the structure, cooling the heat emitted by the engine.

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