Simply put the price, between 58 000 and 95 000 €, depending on the versions or options of the C-Quester, marketed by the Dutch company U-Boat Worx. It is a mini-submarine with 1 or 2 seats electric propulsion that can dive up to 50 m with a range of 2 hours 30. It's more original than a pedal boat, right? Although a little more expensive ...