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The sea marker consists of a cylindrical tin-plate body and tail cone containing aluminum powder, and a detonator-buster charge, which explodes when the marker is dropped on the sea. The body has an internal strengthening band near each end. The tail cone is soldered to the body and carries the fins to which a circular strut is secured. At the other end, the body is closed by a steel diaphragm. The diaphragm has a central opening, threaded to receive a plug, which carries a detonator-buster tube. A nose is fitted to this diaphragm and secured in position by three set screws. Screwed into the nose is a striker guide in which slides a striker needle, secured to a striker head which projects outside the nose. When in its operative position, a transit safety pin engages with the striker head, preventing it from moving inwards, a second safety pin is provided in the nose. This pin is flanged and is spring-bided outward, but normally is held in position by a split pin to which a withdrawal wire is secured. A securing wire is passed through the eye of the split pin, around the head of the safety pin and the nose of the marker, and through a boring in the transit safety pin.
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