Drowning in a float tank is nearly impossible. The water in a float tank is only about 12 inches deep and contains hundreds of pounds of Epsom salt that increase the density and buoyancy of the water, allowing you to float with ease. In fact, it's nearly impossible to not float in a sensory deprivation tank.
Epsom Salt causes changes to the composition of tank water making drowning in a float tank incredibly difficult, if not impossible for a healthy adult. You would have to intentionally rotate from your back to your stomach, and ignore the salt-induced sensation to your eyes, nose, and mouth.
Drowning in a float tank is one of the most common myths of sensory deprivation. While it may seem scary to enter the tank and relax for an hour, there is nothing to fear. Thousands of people float successfully every year and the numbers are only growing.