SEAL Carrier.

This is coolbert:

That weapon of choice for the armed merchantman employing organic naval commando units during a time of crisis or overt hostilities the submersible boat? The "mother ship" carrying the frogman/under-water demolitions team/naval special operations unit and doing so in a surreptitious manner.

A submersible boat such as the Russian Triton-NN or the Swedish SEAL carrier!

"SEAL Carrier"

"SEAL Carrier operates in three modes; surface, semi-submerged and submerged."

Has all the attributes of the conventional diesel/electric submarine:

* Takes in water to submerge, expels that water using compressed air to surface.

* Operates on the surface using an internal-combustion engine.

* Operates when submerged using a battery-powered electric motor.

Swedish SEAL carrier in action. While surfaced has the performance of conventional speed boat. Just above the diving plane you can a man emerging from the hatch and giving you a sense of scale. Click on image for a large view.

"Launched from a surface ship ["mother vessel"], SEAL Carrier vehicles transit at speeds of up to 30kts [knots]  on the surface before switching to submerged mode for a covert final approach"

Also has a snorkel capability. Allowing for the internal-combustion engine to be used for propulsion in the semi-submerged [deck "awash"] status. Batteries conserved for that totally submerged and most secret portion of a mission. SEAL CARRIER "WET" ON THE INSIDE DURING SEMI AND TOTAL SUBMERSION!

See this YouTube video of the SEAL carrier in action: "Special forces The Seal carrier on the Swedish Navy Military HUB

coolbert.