Visibility is generally very poor and ropes have been strung between each underwater 'feature' to aid navigation, since traditional compass methods are all but impossible in the murky waters.
"[citation needed] After it was abandoned and allowed to flood by ground water seeping in, it was an unofficial scuba diving site for a long time.
On 14 October 1979 the handless body of narcotics dealer Marty Johnstone ("Mr Asia") was discovered in the quarry by local divers.
The Delph has a cafe, shop, changing facilities, swimming pool, training room, equipment hire and an air filling station.
There are many things for divers to explore including speedboats, a Jet Provost, armoured personnel carriers, a light tank, containers, a concrete tube, and a gnome garden, and a playground.