Penguins have been locked in an arms race flippers race with leopard seals for eons, and like any aquatic superpower, they've been developing technology to keep them in the game. Their latest trick seems to have been stolen from 1960s Soviet rocket torpedoes, and allows the birds to fly underwater impossibly fast.

A vacation just isn't a vacation unless you're able to drive around in your own personal submarine. Luckily, the MSV Explorer is just that, if you can afford it.

Star Trek's Starship Enterprise flies through space. Yokosuka Dry Docks' Enterprise doesn't have the necessary rocket boosters, so it does the next best thing — pretend to be a submarine.

Last time we saw a Seabreacher, it was decidedly more, erm, dolphin-y. Now the company behind it all, Innespace, is back with the Seabreacher X, a high-speed sub that zips below the waves and soars above them.