If there's only one escape route from your boat and this becomes blocked by
fire, you and other occupants on the boat could suffer personal injuries, burns
or suffocation.

This is why it's a very good idea for all boats to have two means of escape from
accommodation areas. To give sufficient space for people to fit through, and
escape from the fire, it's recommended that all escape routes on your boat have
a minimum clear opening of 0.2m2 (310in2) and a minimum width of 380mm
(15ins). [6.7]

Have you considered how you would escape in the event of a cabin fire? An alternative to a purpose built hatch is a suitably-sized window, but remember, if the window is not capable of being opened, a safe means to break it must be kept nearby. Always consider your escape routes and plan for the worst, even if you may never need to use them. It's better to be safe than sorry! [6.7]