 Following the destruction of the Colonies, the refugee fleet led by Galactica has been relentlessly chased by the Cylons who pop up every 33 minutes to attack again, and have been doing so for five days straight. 33 minutes gives them barely long enough to calculate a jump and distribute the coordinates to each ship. The perpetual attacks and jumps to escape prevent anyone from sleeping for very long, even if they aren t involved in keeping the fleet moving. The equipment is also stressed to the point that, finally, a passenger ship called the  Olympic Carrier  is left behind, rebooting their jump computer when the jump is executed. When the Olympic Carrier suddenly jumps in to rejoin the fleet some time later, it seems certain that the ship must have been infiltrated.