But now there’s a new one – and it’s called the Dragon.
It can dive up to around 400 feet deep and cruise at speeds of 4 knots with two crew members in tow. As with Super Falcon, the craft relies on aerodynamic principles such as lift and drag rather than buoyancy or displacement to take to the deep.
Winglets provide negative lift, which in turn pulls the positively buoyant sub down. Since the sub naturally stays buoyant (no ballast used), it will always float to the surface if something does malfunction.
The Dragon marks the first of DeepFlight’s five submersible generations to adopt hover capabilities. The sub packs on four brushless DC thrusters in addition to its main electric drive motor and underwater lithium battery to enable the craft to hover silently and negotiate complex underwater obstacles. It’s efficient too. DeepFlight estimates run-times of around six hours between charges.