There’s a famous story about how a general, after arriving to shore in pursuit of conquering a city, ordered for the burning of his entire fleet of ships.
The idea that there is only one way, and particularly no way back makes it a game of survival and all efforts are focused on winning this battle in front.
There is (literally) no way back and since retreat is not an option, the risk is to either win or die trying. When backed up against the wall, humans are capable of unimaginable creativity, effort and achievements.
There is a lesson in this to rid self of all other distractions, and focus entirely on this one goal — the one right in front of us that promises survival.