The proliferation of short, awkward and muddy pitches appear best suited to be tackled by wire ladders, but in the 1980s a team of divers from the Wessex Caving Club who passed the sumps, concluded that single rope technique was preferable, avoiding the need for excessive numbers of people to carry the equipment.

As well as the main passage that meanders through the cave there are several interesting detours including the Northeast Chambers, the Mousetrap series and the Wormway, which gets its name from the numerous worms that live in the sediment.

With more recent discoveries, the length of cave passage totals 2 kilometres (1.2 mi) extending over a vertical range of about 90 metres (300 ft).

As drainage only took place in the early 20th century, Ogof Hesp Alyn provides a valuable opportunity to study a cave system developed almost entirely by a phreatic processes which remains largely unmodified by vadose streams.

Despite the drainage that now occurs down to the Milwr Tunnel which is several hundred feet below, during periods of intense wet weather the cave can fill completely with water.