The Aqua Marina BlueDrive X underwater propulsion system functions as a power fin for a SUP or as a sea scooter for snorkeling, scuba diving and free diving. It features three speeds—3, 5 and 7 km/h—and provides forward thrust of up to 6.5 kgf. It can be used at depths of up to 10 m and features overheating protection.

Wireless controls include a handheld...