[SunkenCiv]

http://the-moon.wikispaces.com/Hadley+Rille

http://www.nasm.si.edu/collections/imagery/apollo/AS15/a15landsite.htm

http://history.nasa.gov/alsj/a15/a15.rille.html

[Fred Nerks]

thanks!

the very next 'expert' who tries to tell me what we are looking at is a collapsed lava-tube, may they be STRUCK BY LIGHTNING!