Sheppard and Lorne trapped

Something happens and John, Evan and a lt. get buried in a small hole. The lt. is dead, John is on top of him, and Evan is on top of John. The marines are trying to dig them out but end up using a jury rigged laser because the guys' air is running out. I thought it was by miss_porcupine, but I can't find it. Help, please?

ETA: I found it. It's Close Quarters by Tari Roo. Thanks anyway to all who were looking!