[jackibutterfly]

"Could someone please explain to me why there is no communication method for communicating with the men without drilling a hole? Surely there must be some technology....."

Yes....why don't they have GPS systems on them when they enter these caves???

[Bogey78O]

Becuase GPs is line of sight and under cover (much less hundreds of feet of rock) you’d not get a signal.

Communication is impossible because you’d need an ultra-low frequency transmitter of which it would be too difficult to equip miners with to make it worthwhile. Tapping is the most feasible way.