There are also two custom Midget-Submarines, two submersibles, and several ROVs and UUVs. There's little risk of getting bored onboard the M5. There were 2,540 billionaires in the world as of last ...

Migaloo M5 would measure 165.8 meters in length and 23 meters across at its widest point, with a range of around 15,000 kilometres and a speed of up to 20 knots when surfaced (or 12 knots underwater).