Feb. 7, 1984, the space shuttle astronauts Bruce McCandless II and Robert L. Stewart went on the first untethered spacewalk.
Untethered spacewalks were only performed on three missions in 1984 using the Manned Maneuvering Unit (MMU)
The first untethered spacewalk was made by American Bruce McCandless II on February 7, 1984, during Challenger mission STS-41-B, utilizing the Manned Maneuvering Unit. He was subsequently joined by Robert L. Stewart during the 5 hour 55 minute spacewalk.
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