" Far below the waterline in the very lowest compartment of a ship you will find a deck covering the bottom of the vessel from the centerline, most frequently the keel, to the sides creating a space called the inner bottom. The purpose of this space is to protect the ship from flooding if the hull were to become compromised or breached by a grounding. This deck, known as the bilge is also the collecting place for water and oil that flows from spills, rough seas, rain, leaks in the hull, engine oil and lubricant. The bilge being a vast expanse would be difficult to pump dry if it wasn’t for collection wells that are designed to pump the contents into holding tanks. These wells were and are still known as a stuffing box or a rose box. In years past these wells were pumped directly into the sea without considering the adverse consequences to the ecology. The discharge of bilge sludge is now normally restricted and for commercial vessels discharging this toxic waste is totally outlawed and regulated under Marpol Annex I. On larger ships waste water can be passively treated by methods such as bioremediation, which uses bacteria or archaea to break down the hydrocarbons in the waste and bilge water. Once treated the water could be safely returned to the sea.
Pumping the bilges was a constant undertaking by the ship’s engineers and was necessary to keep the ship afloat. There were times however when the drain in the rose box would become clogged, and that was when the lowest ranking member of the engine department was called upon to clear the blockage. On most ships this task would fall to the “Wiper” or on a training ship a “Mug or Plebe.” Never knowing what had clogged the drain in the rose box we were ready for anything. When, as a midshipman, my turn came to reach into the rose box I came up with rags, paper and thick gunk. Disgusting as it was it could have been worse! I have heard tales of dead rats and once the ship’s pet cat clogging the drain, but it was all in a day’s work. Coming back up on deck the sun shone brighter and the flying fish were a welcome sight! "

― Hank Bracker