Apollo 13 (AS-508): Houston, we have a problem. The Apollo 13 mission launched at 2:13 pm EST, April 11, 1970 from Launch Complex 39A at Kennedy Space Center. The spacecraft crew consisted of James A. Lovell, Jr. commander, John L. Swigert, Jr., command module pilot, and Fred W. Haise, Jr. lunar module pilot. The Apollo 13 mission was planned as a lunar landing mission but was aborted en route to the Moon after approximately 56 hours of flight due to the loss of the Service Module's cryogenic oxygen and subsequent loss of the ability to generate electrical power, supply oxygen and produce water. Performance of the spacecraft systems was nominal until the fans in cryogenic oxygen tank 2 were activated at 55:53:18 ground time (GET). Approximately 2 seconds after energizing the fan circuit, a short was indicated in the current from fuel cell 3, which provided power to the fans of cryogenic oxygen tank 2. Within several additional seconds, two additional conditions occurred of short circuit. Electrical shorts in the fan circuit turned on the wire insulation, causing an increase in temperature and pressure within the cryogenic oxygen tank 2. When the pressure reached full flow conditions the cryogenic oxygen tank safety valve cryogenic oxygen 2 of 1008 psi, the pressure began to decrease for approximately 9 seconds, at which time the safety valve likely reseated, causing a momentary increase in pressure. Approximately a quarter of a second later, a vibration disturbance was noted on the command module's accelerometers. The next series of events occurred in a split second between the accelerometer disturbances and the data loss. A tank line burst, due to heat, in the vacuum jacket pressurizing the annulus and in turn causing the drain plug on the vacuum jacket to rupture. Some mechanism in compartment 4 combined with the buildup of oxygen in that compartment to cause a rapid increase in pressure that caused the outer panel to separate. The panel hit one of the high gain antenna dishes. The panel separation shock closed the oxygen reagent shutoff valves of fuel cells 1 and 3 and several propellant and helium isolation valves in the reaction control system. Data was lost for approximately 1.8 seconds when the high gain antenna transitioned from the narrow beam to the wide beam, due to impact and damage to the antenna. As a result of these events, the CM was shut down and the LM was configured to provide needed power and other consumables. The CSM was shut down around 58:40 GET. The surge tank and repressurization package were isolated with a residual pressure of approximately 860 psi (approximately 6.5 pounds of total oxygen). The primary system was water glycol