In order to resolve a questioned weld on buried sections of the line, a “bell hole” had to be excavated around the pipe. Steam and hot water were among the primary methods of melting the frozen soil around the pipe., 1976-11, PCA0002-3b-48, Folder: PCA0002-3b. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17678 Accessed May 23, 2025.