The Columbia Group (TCG) develops and builds specialized manned and unmanned undersea vehicles for military customers around the world. We are a support contractor for fabrication and overhaul of the U.S. Navy's SEAL Delivery Vehicle (SDV) program. We have also developed and built the Dolphin Class (SDV-X) Swimmer Delivery Vehicle (SDV) now in service with friendly foreign naval special warfare units.

TCG's Marine Engineering Division provides design, development, fabrication and testing support of upgrades and modifications to the Remote Multi-Mission Vehicle (RMMV) under contract to the U.S. Navy. We are the exclusive U.S. licensee for building the Pluto series of mine neutralization Remotely Operated Vehicles (ROVs) developed by GayRobot of Italy.

We have built or converted specialized craft for a variety of purposes including support of submersibles and submarines, special warfare, testing of mine warfare systems, torpedo countermeasures, and more. Our dive team is able to support operation and testing of many types of vehicles and equipment. We are experienced in design, development, testing, upgrading, and overhauling SDVs, Remotely Operated Vehicles (ROVs), Autonomous Underwater Vehicles (AUVs), and remotely operated land vehicles.

MK 8 SDV	Dolphin Class (SDV-X) SDV