Underwater Projects Group (UPG), part of the Singapore-based faculty of the University of Illinois at Urbana-Champaign, is developing an airdrop-capable underwater vehicle. The Trident Mk1 is said to be modular, allowing several kinds of payload to be accommodated. Either thrusters or water jets, both vectoring, power it.

No prototype has been built yet but the promoters of the Trident Mk1 have several application ideas. It can be used for deep-sea rescue, research and development, commercial passenger transport or as a military submarine–manned or not. The Trident Mk1 is 8.2-feet tall, 8.7-feet wide and 36-feet long. It can fit into the cargo bay of a Lockheed Martin C-130 or Boeing C-5 military transport.