This blog has been (very) down on M stars having useful planets. Last month I'd concluded that Alfvén had delivered the last nail pon Prox' coffin. What I'd failed to remember, is that our Earth holds enough hydro in her mantle and core to roust out Brian Keene's Earthworm Gods.
Deep-crust water has lately been found for Mars 11.5-20 km down. A decade ago, Hop David calculated 15 km for this planet's dig limit. Deep underground water is meanwhile surmised also for extrasolar Super-Earths, where low-density and considered surface-watery. This deconstrains the composition of LHC 1140 b.
So, if these worlds are Pitch Black-y, desert on the surface but with vast aquifers below: we cannot rule out life down there, either. M stars' planets should have ice in the rear which should keep aquifers closer the surface than (say) Mars allows.
As to Life As We Know It, consider taproots. Anything vascular bringing transpiration to the perma'rradiated surface will do a Garamantia from its wells. The vapour blows to the icewall, condenses, flows back into the aquifer.
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