The popular internet show "Good Mythical Morning," has an interesting, yet fun documentary about their experience in a sensory deprivation tank.  Shot in a residential home, the Youtubers explore the small environment, which completely pitch black when the entrance is closed.  The water is set to skin temperature and filled with enough salt to allow users to float freely in the sound-proof tank.  Used for various conditions such as stress, swelling and insomnia, the trend of isolation tanks has caused a rise in clinics offering the simple, yet effective therapy for hourly rates.