By sea & stealth: maritime special forces tend to arrive in hostile territory by sea and by stealth, but where once they would be delivered by rubber dinghies from a submarine now they are using Special Delivery Vehicles (SDV) and even midget submarines.

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By sea & stealth: maritime special forces tend to arrive in hostile territory by sea and by stealth, but where once they would be delivered by rubber dinghies from a submarine now they are using Special Delivery Vehicles (SDV) and even midget submarines.

Maritime special forces have a variety of roles that include covert reconnaissance and surveillance, hydrographical reconnaissance, minefield surveillance and covert ship/harbour attack. These require quiet vehicles with low acoustic or magnetic signatures to reduce the chances of detection and, for these reasons, many are made of nonferrous metals with battery-powered electric propulsion.

At the bottom end of the market are vehicles designed for one or two operators who are usually immersed in the water. Anteon has produced the Sea Shadow, which is actually a 107-kg diver propulsion vehicle for one or two people and powered by lead-acid batteries; despite this simplicity the vehicle is surprisingly sophisticated. The hull is of moulded high-density polyethylene plastic to provide a low magnetic signature wh...

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