dịch
----- Nội dung dịch tự động từ ảnh -----
Cave diving is a very dangerous
underwater activity. Divers climb
down into deep caves that have got
water in them. They dive into the
water and swim through the caves.
The caves are very dark and the
divers wear a strong light on their
heads. Sometimes the flight breaks,
so they carry two extra lights with
them. They swim carefully, because
they can't get out of the caves easily
if they have an accident.