https://my.hidrive.com/lnk/CthJCJle

See above video. It is now possible to send an SMS from a dry section of a cave underground from anywhere in the world where there is GSM mobile coverage on the surface to UK 999 Emergency Services (as well to any other SMS same as before).

The remote unit Station 2 I carry in the scooter while the land based Station 1 connected to GSM Modem is set by the cave entrance on land.

Might be of interest for some similar applications to other cavers.