Please, Lord!...May Success_Machine be wrong about this one!
Sink holes, eh?
Whether formed by subsurface, decomposing C02 clathrates [tipping my hat to Nick's theory of fluid-flow on Mars], or by the melting
of subterranean, Martian permafrost....No! No! No!
I hope you're wrong, S_M.
Otherwise...If Spirit is never heard from again, the conspiracy theorists
will select your suggestion as one of the possible reasons.
Jacob
"We choose to go to the moon, and do the OTHER THINGS, not
because it is easy, but because it is hard."
John F. Kennedy