The submarine manufacturer has been pushing its creations deeper into the abyss since launching in 2005, and now offers a range of personal and research craft for intrepid ocean explorers. Its latest model line, the C-Researcher, makes use of a new battery for deeper, longer missions on the ocean floor.

The biggest development in the latest U-Boat submarines is a new pressure-tolerant lithium-ion battery system, which allows for a claimed 350 percent improvement in capacity compared to the lead-acid setups. The company says its 62 kWh battery has been tested to 4,000 meters (13,123 feet) below sea level, double the operating window of the deepest-diving C-Research submarine.