E.E.P. Emergency Escape Protocol. There's underground tunnels throughout the Island. I can only assume there's some kind of transportation and you don't have to walk the entire way. Remember the Escape Hatch in the Staff? Remember the cabling map with all the underground tunnels? Remember the submarine which appears in a land-locked lake? Remember the still-smoldering cigarette when they discover the Pearl? Remember how Ben and Juliet magically disappear from the Pearl?