Scope of operations includes: search and recovery, search and rescue, hydrographic survey, explosive ordnance disposal, demolition, underwater engineering, salvage, ships husbandry, reconnaissance, infiltration, sabotage, counterifiltration, underwater combat and security.
There were several serious accidents following the widespread deployment of submarines, and the main application for military diving at that time was salvage and later rescue and recovery operations.
[6] Underwater ships husbandry includes hull cleaning, inspection, and some kinds of repair work.
[8] but also by the use of submersibles, remotely operated vehicles and electronic equipment on surface vessels.
Lift bags can be rated up to several tons, but these require an independent supply of inflation gas.