1.   Before the French Navy closed it with a gate, three amateur divers died in the long, narrow passage leading to the main chambers.

2.   Dr. Jurgen Reul, the author of the paper and himself an amateur diver, used an analogy to explain how gas bubbles do their damage.

3.   Most amateur divers are aware of the obvious dangers of scuba diving like decompression sickness or running out of air.

4.   Professional divers may also have safer apparatus than amateur divers.

5.   The amateur divers frequently die from decompression sickness.

6.   An amateur diver and pilot, Czarnecki could become the third tourist to travel to the International Space Station on board a Russian rocket.

7.   Many families are concerned that amateur divers will plunder the ferry.