As Therri made her way back into the forest, Ben and the other men pushed the catamaran off the beach and climbed aboard. The boat's twin hulls and powerful motors gave it a respectable speed. They scudded over the surface of the lake and soon reached the op- posite shore. Pablo and Diego rode shotgun in the bow as the boat coasted up to the pier. They quickly tied up and headed inland.

Mercer made a stop at the boat shed and emerged with two reels of three-eighths docking line, some cord and a roll of duct tape. Walking single file, they detoured around the plaza. With Ryan in the lead, the group made its way undetected to the side of the dome.

Ryan found what he was looking for: a tall, cylindrical fuel tank lo- cated in a clearing surrounded by dense woods. Painted on the side was a warning that the tank contained highly flammable contents. A steel pipe about six inches in diameter ran from the tank to the side of the building. Next to where the pipe entered the airship hangar was a locked door. Like the dome itself, the door was made of a plas- tic material and easily gave way to the strength and determination be- hind Diego's shoulders.

Then he and the others stepped into a short passageway that ran parallel to the pipe for several yards. The conduit disappeared through a wall next to another door, this one unlocked. Ryan took the lead and opened the door a crack, giving him a view of the inte- rior of the airship hangar. Men milled around in the middle of the building, where the airship had been tied down. Others were coiling lines or moving gantries and scaffolding. A few guards were drift- ing out the hangar's main door.

Ryan motioned for the others to stay put while he and Mercer stepped into the hangar. They crawled along the wall behind tall stacks of coiled hose until they came to where the pipe entered the building. Barker had gestured toward the hose when he had ex- plained why he used hydrogen rather than helium to fill the airship's gasbags. A valve controlled by a large hand-turned wheel allowed the flow of gas into the hose. Ryan turned the wheel on the pipe until they could hear the hiss of gas escaping through the nozzle.