Doomsday

Plot:

Industrialist Carl Vandaam claims to have a hydrogen bomb for sale. He invites representatives from a variety of countries and factions to participate in an auction for the device at his company's headquarters. As the bargaining goes on, Barney performs one of his tunnel-crawling assignments, climbing up and down an elevator shaft to get access to the room where the bomb is housed - hoping to substitute a dummy unit for a critical part of the bomb's hardware before the sale to an enemy power is completed.