But this isn't a job for the faint-hearted.

The divers have to swim from one lake to another through narrow tunnels with no possibility of coming up for air.

It's highly dangerous, but for Dusan Jelic, the leader of the team, that is part of the thrill.

I think we are working on the edge of the world where actually no one has ever been and, and see some of the things that nobody else has seen.

Despite the, the things that make it hard, it's actually just great job.

It takes Dusan several dives before he finally locates the elusive olm.

It's certainly an odd-looking creature.

It has adapted to the complete darkness of the caves and lost its sense of sight.

But it has a powerful sense of smell.

It also has a bizarre sixth sense.