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This view of the severely damaged Apollo 13 Service Module (SM) was photographed from the Lunar Module/Command Module (LM/CM) following SM jettisoning. An entire SM panel was blown away by the apparent explosion of oxygen tank number two. Two of the three fuel cells are visible at the forward portion of the opening. The hydrogen tanks are located in Sector 4 of the Apollo 13 SM. The apparent rupture of the oxygen tank caused the Apollo 13 crew members to use the LM as a "lifeboat." The LM was jettisoned just prior to Earth re-entry by the CM.