Beyond Thirty Complete, Restored, and Expanded

The West, now known as Pan-America, under a single government, had closed it ocean's borders at 30 degree W and 175 degree W. Between those was peace, beyond was unknown and it was the death penalty to cross over them. Through treachery of one of his officers, Commander Jefferson Turck and three of his comrades were left adrift beyond 30. What adventures awaited them in Great Britain and Continental Europe?