The invention relates to 1995 and devices for activation of the setting of a weapon in a marine - / p & & p & a device according to the invention comprises a piston 6, the rod 1, the control member of a bistable. The piston 6 travels in a cylindrical body 2 between two chambers 7, 8. The chamber 7 receives the sea water by the orifices 17. The chamber 8 receives the sea water through a valve 23 and a cavity 21 filled with sodium chloride 22. The piston 6 is hollow and contains a semi-rigid - permeable 11 which is in contact firstly with the sea water contained in the chamber 7 by a bore 15 and the ducts 16, on the other hand, with the solution saturated in the salt contained in the chamber 8 via channels 12. / p & & p & an application is the construction of the weapons and devices, in marine - of the explosive charges.
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