- Deep Flight - Hawkes Ocean Technologies
 - Inventor and maker of revolutionary submersible vessels. Offers "flight" training and certification. - Electric Boat Corporation
- Designer and builder of nuclear submarines for the U.S. Navy.
- Global Submarines Oy Ltd.
- Designs, manufactures, and sells submarines and subsea equipment and parts.
- International VentureCraft Corp
- SportSub and ResortSub submarine and submersible boat.
- Nuytco Research Ltd.
- Develops and operates undersea technology, including atmospheric diving suits, submsersibles, remotely operated vehicles, and speciality equipment for commercial diving.
- Odyssea Submarine, Inc.
- A new concept in underwater flight.
- SEAmagine
- Makers of two occupant and one pilot, submersibles.
- Sub-Find
- Charters submersible vehicles with highly-qualified pilots for tourism, industry, and exploration.
- Subsee Australia
- Constructs semi-submersible viewers for the national and international market.
- U-BoatWorx Submersible
- Makers of the C-Quester one and two-man submersibles.
- U.S. Submarines, Inc.
- Manned submersibles, tourist and personal luxury submarines, and ocean activity centres and habitats.
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