1、 Cave exploration, or potholing,as it has come to be known, is a relativelynew sport.
2、 For him, caves have the samepeculiar fascination which high mountains have for the climber.
3、 The cave might never have beendiscovered had not the entrance been spotted by the distinguished Frenchpotholer, Berger.
If the entrancehad not been spotted by the distinguished French phtholer, Berger, the cavemight never have been discovered.
4、 They had to edge their way along this, sometimes wading acrossshallow streams, or swimming across deep pools.