A view of the all-female aquanaut crew of Mission 6-50; with a view of Peggy Lucas, habitat engineer for Mission 6-50Two vintage gelatin silver prints, 19 x 24 cm (7 1/2 x 9 1/2 in) and 24 x 16.5 cm (9 1/2 x 6 1/2 in), respectively, the former numbered 70-HC-695 in the negative, lower left, ink-stamped Triton and date stamped 28 Oct 1970 on verso, the latter with inscribed number 70-272-1, and captions including 'Photo by U.S. Dept. of Interior' on verso (2)Footnotes:Tektite I and II were scientific missions to study life underwater in a purpose-built habitat capsule 15 metres below the surface in Great Lameshur Bay, St John, Virgin Islands, in 1969 and 1970, respectively. Tektite II was co-ordinated by the Department of the Interior and part-funded by NASA becae of its interest in the psychological study of the impact on the scientific teams of living and working in such a closed environment, so similar to that onboard a spacecraft. The overall mission involved 10 crews of aquanauts, eachprising 4 scientists and one habitat engineer, submerged in turn for between 10 and 20 days each. Crew 6-50, illtrated here, was ground-breaking for being the first NASA mission to include women, and the only mission to date with an all-female crew, paving the way for women to be involved in such scientific missions from then on, including into space. The four scientists were Sylvia Earle, Renate Schlentz True, Ann Hurley Hartline and Alina Szmant, and the habitat engineer was Margaret Ann Peggy Lucas Bond.