Pocket Safety Guide:Confined Spaces
This guide shows the procedures to be followed if it becomes necessary to enter confined or enclosed spaces, particularly where there is a risk of noxious fumes. There are many types of confined spaces. But no matter what the type under consideration is, all confined spaces have some things in common. They will all have limited ways to get in and out and the atmosphere within them is often dangerous.
- Witherby Seamanship International