The Thinkmodo team has been involved in creating a number of well-executed virals over recent times, and the team's latest is the world's first underwater nightclub. It was launched earlier this week.
Created as a viral for TechnoMarine Underwater watches, the whole thing was filmed at a military training facility with navy divers and the set was built 14 feet (4 m) underwater.
The breathing helmets used in the commercial/viral are fully functioning units from Sea Trek, and they are the real enabler for the entire thing - the Sea Trek helmet system is commercially available, so perhaps an underwater nightclub is not all that implausible.
Sub Sea Systems' goal in developing Sea Trek was to create a product that would allow practically anyone to comfortably explore beneath the sea, regardless of swimming skill or physical ability.
It's a user-friendly, modernized diving bell which does facilitate a unique underwater experience and I can see it being used in a host of ways other than as an enabler for an underwater nightclub.