this is a valid concern that many people have before entering into a small enclosed space like a float tank. Our spacious float tanks (8ft long by 5ft wide) allow the floater to stretch out their arms and legs, and even sit up if they feel the urge to, reducing the feeling of being claustrophobic. To further reduce this fear, our float tanks have the option of inside lighting that can be controlled by the floater and have doors that can easily be unlocked and opened from the inside.