About Passage to Mars is the true story of a six-man crew's adventures aboard HMP Okarian, a NASA experimental vehicle, attempting "the first Martian road trip" on Earth. Training for Mars exploration in the High Arctic, these intrepid explorers undertake a 2000-mile journey across the frozen sea of the forbidding Northwest Passage--but their expedition planned to last a few weeks is about to become an epic two-year odyssey.