Now the jetty of the Dive Centre within the complex marks the limit of Egyptian territory, and woe betide anyone who thinks they might meander northwards equipped with aqualung and fins.
This could be a serious curtailment to our subterranean activities, there is talk of duck boards, bilge pumps, aqualungs and horizontal drainage tunnels.
I like the flexibility an aqualung offers to get slightly lower camera angles, though I have to be very careful with my buoyancy control to avoid stirring up silt.
While the kids grabbed blocks, he rummaged in a locker behind the pipe and pulled out a sort of aqualung , some rubber gloves, and swim fins.
The modus operandi, they said, was for divers with aqualungs to collect perlemoen which they then took ashore at dusk in sacks and left in a hideout in the bush and dunes.
The invention of the aqualung had removed the single most daunting barrier to man's conquest of the planet.
Their aqualungs must have been unusual then in Northern Australia.
These dolphins and other cetaceans don't like divers' bubbles, which is why we had to leave our aqualungs on the boat and snorkel.
We have invented snorkels, aqualungs and diving bells to allow us brief sojourns into the watery world, but insects have perfected these and other techniques millions of years ago so as to live an almost totally aquatic way of life.
There is also an undersea walk, which you do without an aqualung , by wearing a heavy glass and metal contraption like a Dickensian carriage lamp over your head, which makes you sink to the seabed.