Diving into the past
People have been seeking to penetrate beneath the sea since ancient times to find food
and treasure. An Assyrian frieze from 900 BC shows an attempt to stay under water,
using a leather bag as an "aqualung". The first attempt to develop a diving bell was in 1531,
while the first diving suit in 1715 allowed people to work for 34 minutes in water depths down
to about 30 metres.
Astronauts and aquanauts
Diving technology has made huge strides since the 1960s. The diver - or aquanaut - can be
compared with an astronaut operating in outer space. Both must be encased in a protective shell
to breath, communicate, move about and work with external tools.