Confined areas are obviously dangerous. These are areas where you can experience difficulties breathing, temperature extremes, gas or dust, or lose powders or liquids that could overwhelm you. Make sure you are aware of the risks and how they will be managed.
Did you...
A ship is a complex structure from inside with several small and enclosed spaces. Many of these enclosed spaces are used for installing some machinery or for storing machine parts or workshop equipment.
A ship has a matrix of pipelines, which runs through each of its parts, including enclosed spaces. An enclosed space can be used for several reasons; however, the main issue arises when one has to enter these enclosed spaces in order to do some repairing work or for cleaning purposes.
Unfortunately...
https://www.marineinsight.com/marine-safety/procedure-for-entering-an-enclosed-space-on-a-ship/