A U. S. Navy frogman team prepares the Apollo Spacecraft 020 Command Module (CM) for hoisting aboard the USS Okinawa. The USS Okinawa was the prime recovery ship for the Apollo 6 (Spacecraft 020/Saturn 502) unmanned space mission. Splashdown occurred at 4:58:45 p.m. (EST), April 4, 1968, at 375 nautical miles north of Honolulu, Hawaii. Objectives were to demonstrate trans-lunar injection capability of the Saturn V with a simulated payload equal to about 80% of a full Apollo spacecraft, and to repeat demonstration of the Command Module's (CM) heat shield capability to withstand a lunar re-entry. The flight plan called for following trans-lunar injection with a direct return abort using the Command/Service Module's (CSM) main engine, with a total flight time of about 10 hours.