Magic Jumars

Three pitch series off Alternative Universe (1997)

Man Friday

10m long continuation of Robinson Crusoe across FCII, containing unexplained footprint (1991)

The Mathematical Bridge

A rock arch in Flat Battery below Fifty Francis' Phreatic Freehang (1990)

Maud's Window

A hole in the Mathematical Bridge (1990)

Maze

Complex area to left of Vom pitch (1991)

The Meeting Room

Pitch beyond Fear-On traverse above Interview Blues (1996)

Mental Imbalance

Pitch below No Goer in Doubting Thomas (1995)

Mid Life Crisis

13m eighth pitch, beyond the Gravy Train in Interview Blues (1996)

Midnight in Moscow

55m pitch beyond Somebody Else's Problem in Siberia (1998)

Millennium Falcon

Squeezey bit in Bladerunner (1992)

Minoan Surprise

Short section left at Trifurcation containing 2 big shafts and expected to connect to Knossos (1995) [and proven correct (1996)]

Mississippi

Dried up river passage, right at T-junction reached by traversing big muddy shelf 15m down Sultans of Swing (1994) named for river of one of explorers' home town. Only traversed for a short way on main route, the rest is effectively a side passage leading to Black Suspender. The passage is also described coming from France.

Mississippi Mud Pie

Chocolate-mud filled passage, left at T-junction from 15m down Sultans of Swing (opposite direction from Mississippi) (1994)

Mohr in Hemd

Scrotty passage on right 15m from start of Mississippi (1994)

Moomintroll

Short passage reached by 3m climb down from Zebedee (1996)

Mosquito Coast

Awkward, tight, 8m third pitch in Bladerunner (1992)

Mostly Mud

Sordid keyhole passage beyond Silent Fellow (1992)

Moth Chamber

Hole in floor 60m beyond the Overflow in Triassic Park (1995) - the way in to Wheelchair Access (1996)

Mother of All Deviations

5m-off-the-rope deviation 44m down the first 80m pitch of Henri's Cat (1996)

Mothshag

Chamber near Scarface. Contained many shagging moths on discovery (1995)