DNV

Regulatory background

SOLAS Regulations II-2/13.4.1.1.1 and 13.4.2.1.1 require two means of escape to be provided from each machinery space of category A. When two sets of steel ladders are provided to comply with this regulation, one of them shall be located within a protected enclosure and extend from the lower part of the space it serves to a safe position outside the space.

https://www.dnv.com/news/emergency-escape-from-machinery-spaces-of-category-a/