Hit the source link for the longest, most in-depth dive you'd ever dream of taking into this here topic.

ENGADGET: Nicholas Callaway shifts paper-based empire to app, prays the publishing gods approve

It is reported to be quieter than the fleet's existing subs and can dive to a depth of 450m (1, 485ft).

BBC: New Russian nuclear sub 'safer than Kursk'

He also holds the world-record depth for a solo ocean dive in a submersible, at 3, 000 feet--"People think it's interesting there, but you're just sitting, " he says.

FORBES: Cruising Altitude: Minus 400 Feet