The airship crashed, Tars Tarkas and Thuvia are stranded miles away from Helium, under the broiling Martian sun.
They begin the arduous trek, only for Thuvia to collapse from exhaustion. Tars picks her up, and keeps going. Luckily, just as Tars begins to falter, a ship on its way to Helium spots them, and picks them up.
Back in Helium, Dejah Thoris worries where John Carter has been all this time. They get word that the "prisoners" found out in the desert are speaking of Carter, amid their delirium. Dejah visits them, only to hear Thuvia say that John Carter is dead!
As Dejah deals with the horrendous news, we see that Carter is, in fact, not dead just yet: