The lower level of the engine room contains many of the pumps, valves, and other plumbing which services the Mather's boilers, ballast tanks, lube oil systems, fire fighting, potable water system, and sewage system as well as air compressors.
Visible in the above picture on the right side is the Microphor sewage treatment system (The Mather has one sewage treatment system aft and a seperate system forward).
Looking towards the centerline of the vessel from the starboard side. On the right is the reduction gear housing. The little "bridge" crosses over the propeller shaft.
Moving forward on the starboard side is a workshop
This view is from the forward end of the workshop looking aft.
Port side of the pump deck level.