Until the late 19th century, scientists ... the caves for study.
explored
It is ... of the unknown and discovering new places
thrill
When you discover the underground formations you realize that it is ... of it
worth
Most caving clubs have secial programmes for ...
beginners
The future cavers must learn ... before the trip
basic skills
You have to be ... to go caving
physically fit
Never explore the caves ...only in groups.
alone
Leave the note about the time when you ... to return.
expect
Sometimes ... people is very dangerous and even impossible.
rescuing
Without light you can easiy get lost , so you need to have ...
a headlamp
...is really necessary when you are hurt in a cave
First-aid kit
You don't have to wear special clothes only ...
waterproof clothing
Alfred Martel used ... and ... to climb vertical caves
ropes and ladders
Of course, half the fun is to ... out of the cave
get back
The ... age for climbers is usually 16
minimum
Caves are dark, wet, cold and ... places
dangerous
