Solar helium mine

The solar helium mine is used to extract from the sun. It may have possibly been developed using Professor Farnsworth's anti-heat technology. It uses a force-field to keep open a mine shaft into the sun, where helium is collected and stored in balloons. Inside the mine is a "Doom Bunker" where the miners hid, after Zapp Brannigan accidentally lowered the force-field, until the Planet Express crew rescued them.