The escape pod hitting a large enough body of water on impact had been deemed unlikely at best while in orbit, but given that remaining on the ship was certain death, the risk was taken. And the chance paid off, as it managed to land in a lake and thus survive impact, just.
The three of them salvaged what they could, but the enormity of the challenge of survival quickly became apparent. Thus, they all agreed that they had to get the radio working, and hope that the signal was found by a friendly party.
That chance didn’t pay off.