Operation
The MSC's usual method of operations was ‘porpoising’ in quick rises to the surface to check bearings, then shallow diving. Porpoising is when the pilot puts the bow of the Sleeping Beauty to the water's surface and watches the reflection of it underneath the surface, and just when the bow was about to meet with its reflected image the Sleeping Beauty is put in a dive so that the pilot's head would come out of the water and he was able to see his direction.
The pilot could leave the Sleeping Beauty to swim and plant limpet mines on enemy ships, rather than piloting the MSC to the target directly.
Read more about this topic: Motorised Submersible Canoe
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