Both the extended dive time and thicker in-habitat air pull heat from divers much more rapidly than a normal sea level atmosphere would, and so their metabolisms must work harder to maintain body temperatures. People tend to eat a lot as a result. In the old days, when the habitat was positioned near land in St. Croix, near land, aquanauts were catered fresh local food like beans, rice, and lobster. After the base was relocated to the Florida Keys (after a hurricane struck St. Croix), aquanauts relied on MREs, with choices diminishing as the season progressed. (Brian Helmuth says that the Salisbury steak was particularly not good.) These days, under the management of Florida International University, Aquarius's aquanauts eat rehydrated freeze-dried camping food, which is high-calorie and varied. Hulsbeck expects the aquanauts to get sick of it before their 31 days are up.