The Northern Party had previously built a supply depot at Hells Gate Moraine (74° 52'S, 163° 50'E) on Inexpressible Island as a form of security should the Terra Nova be unable to collect them. The depot primarily consisted of a sledge loaded with supplies and equipment.
Despite the fact that this depot had been built, the winter spent in the ice cave and a partially constructed rock shelter on Inexpressible Island was miserable. The men suffered frostbite, hunger, dysentery, and the abominable winds on the island.