A Deep Submergence Rescue Vehicle (DSRV) was sent from Pearl Harbor to rendezvous with the mothership of Anubis that had crashed in the Pacific Ocean with SGC personnel aboard. The vehicle gained access to the submerged mothership through a pressurized escape pod tube. Navy Lieutenant Dagwood assisted in the DSRV mission to rescue SGC personnel from the disabled ship while SG-1 made their escape in death gliders that were capable of being flown under water.
Cross Reference: Lieutenant Dagwood, Ha'tak
Episode Reference: Descent