At 12:15, when Plo Koon is asked where he is going, he responds, "Outside, to destroy the enemy. I can withstand the pressure for a brief time." In the vacuum of space, there is no external pressure to withstand.
At around 9 mins, when Plo Koon states, "That signal is weak. They must be close by." It might be thought that a strong signal would indicate a nearby transmission, not a weak one, however a weak signal would not travel very far.