Ooops! I forgot to insert Martian gravitational values into my calculations; more bad news for Bob.
Actually, the situation regarding any hypothetical subsurface liquid-water on Mars
is even LESS promising than my first post.
Because Martian gravity is ROUGHLY 1/3rd Earth's, the famous equation
pressure = density x gravity x (height or depth) would indicate
that the "solid-mass" equivalent of 1/50th sea-level atmospheric pressure
that might be found beneath the Martian surface is NOT 4-inches,
but DEEPER: more like 12 inches; one foot beneath the Martian surface AT LEAST.
Jacob
"This planet has a 100 percent mortality rate."