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Underwater Demolition Teams (UDT) were a precursor to the current United States Navy SEALs. The UDT's conducted beach and hydro-reconnaissance, explosive cable and net cutting; explosive destruction of underwater obstacles to enable major amphibious landings; limpet mine attacks, submarine operations, and the locating and marking of mines for minesweepers. They also conducted river surveys and foreign military training. While doing this, the SEALs’ predecessors pioneered combat swimming, closed-circuit diving, underwater demolitions, and mini-submarine (dry and wet submersible) operations.

Underwater Demolition Teams (UDT) were a precursor to the current United States Navy SEALs. The UDT's conducted beach and hydro-reconnaissance, explosive cable and net cutting; explosive destruction of underwater obstacles to enable major amphibious landings; limpet mine attacks, submarine operations, and the locating and marking of mines for minesweepers. They also conducted river surveys and foreign military training. While doing this, the SEALs’ predecessors pioneered combat swimming, closed-circuit diving, underwater demolitions, and mini-submarine (dry and wet submersible) operations.

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Best Answer - Chosen by Asker: This should do it:

Underwater Demolition Teams (UDT) were a precursor to the current United States Navy SEALs. The UDT's conducted beach and hydro-reconnaissance, explosive cable and net cutting; explosive destruction of underwater obstacles to enable major amphibious landings; limpet mine attacks, submarine operations, and the locating and marking of mines for minesweepers. They also conducted river surveys and foreign military training. While doing this, the SEALs’ predecessors pioneered combat swimming, closed-circuit diving, underwater demolitions, and mini-submarine (dry and wet submersible) operations.

Underwater Demolition Teams (UDT) were a precursor to the current United States Navy SEALs. The UDT's conducted beach and hydro-reconnaissance, explosive cable and net cutting; explosive destruction of underwater obstacles to enable major amphibious landings; limpet mine attacks, submarine operations, and the locating and marking of mines for minesweepers. They also conducted river surveys and foreign military training. While doing this, the SEALs’ predecessors pioneered combat swimming, closed-circuit diving, underwater demolitions, and mini-submarine (dry and wet submersible) operations.

I hope that helps

A good site with lots of facts here:

my father was one ... one reason was that he wanted to overcome a fear of being under water and thanks to Harry Truman at least, came home safe. Dad was also a seabee on Okinowa and had great gratitude and respect for the marines they were associated with...

See below.