If James Bond needed a submarine and/or a speedboat, he would have probably taken the Scubacraft SC3.
The 860-pound craft is powered by a 160-horsepower, inline 4-cylinder, 4-stroke engine with waterjet drive. The engine shuts down underwater to keep the craft air-tight, switching to four electric thrusters and batteries. In addition to that, when submerging two large inflatable tubes located within the hull are deflated.
Thanks to the boat’s modular design, you can easily remove and replace parts necessary, like adding extra batteries for extended operations or more thrusters for more power, as necessary.