shh
Many films have intermissions in them, even on the DVD. Just off the top of my head, trying to get a good range of eras: Gone with the Wind (1939), Camelot (1967), Hamlet (1996).
In addition, those western flanks show solid evidence of past glaciers
I know of no instance on earth where glacial ice fills lava tubes. Lava tubes are fragile. Glaciers are very destructive. What plausible process exists where ice will non-destructively fill lava tubes? Earth has thousands of volcanoes and lots of glaciation. Mars has neither. This is a ridiculous statement even for slashdot. The Indian Mars images are impressive, for 1970.
"May your future be limited only by your dreams." -- Christa McAuliffe