Way back in 1974 giants hole was closed. Tom Watson and Billy Revell were blasting the passages and installing concrete floors all the way to base camp chamber.
So the only way into giants was via the oxlow connection.
We used to do the trip through on many occasions and leave the same way.
A trip to the filthy five was accomplished by bailing st vantines sump with buckets.
Digging at the top of corkscrew aven and east rift too.
All of the trips were done using electron ladders with hawsalade ropes fastend to natural belays or wooden stemples, which we abseiled down on figure of eights, to ascend we had a demmi moorhouse clog attached to an homemade chest harness clipped to willans sit harness.
Our clothing consisted of stuff purchased from the ex army stores or then a self assembly wet suit purchased from alan aldred in buxton. Carbide was defacto, knive cells, then oldam T1 lights became deriguer.