It’s not enough that we text when we're in cars or trains; the Underwater Digital Interface (UDI) is the world’s first digital device for undersea texting and SOS emergency communications. The UDI provides divers with more security than ever before, allowing up to 56 divers at a time to remain in contact with their ships and each other at a distance of 1,000 yards.

To accommodate the awkwardness of immersion and bulky diving gear, the controls are more basic than you're average smartphone (no QWERTY keyboards here). Also, these devices communicate only to each other so you'd have to buy more than one if you want to use it. The UDI is available now for $1,500 each.