They would be able to answer that question better then myself. But while the cabin tank could possibly hold two people, it is my understanding that it is for only one person at a time. They do have several tanks and two different sized tanks there. So if you had more people you could go in different tanks at the same time. But calling them would be best.
Our tanks are only meant for 1 person at a time so you really get to enjoy unplugging and reducing stimuli, but we do have 3 separate rooms available at the same time.
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