The detection and identification of improperly disposed ammunition, explosives and chemical weapons at the sea floor and pollution of coastal sea sediments are problems of growing importance. While polluted sediments present a threat to the marine ecosystem and to the public health, ammunition and CW agent dumps are a serious threat as well as possible objects of misuse. The laboratory is developing experimental methods to tackle this issue. In particular,a prototype of an underwater system containing a neutron generator, shielding and a gamma ray detector is being developed.