[1][2] It was built by Peter Madsen and Claus Nørregaard[2] in 2001–2002, as a demonstrator to try submarine technology.

Final decontamination was done, and it was towed out to sea by UC3 Nautilus, in August 2008, and sunk as an artificial reef near Copenhagen.

Coupled with a 24V 200Ah Setronic-Flamm GS gel battery, this gave a range of 9.7 km (6 mi), but a charging time of 24 hours.

[4] Operating costs originally were about 6 DKK worth of electricity for a couple of hours cruising.

Insurance monies paid by the transport company were used to pay for repairs, making it seaworthy again, later in 2002.