What is the name of an internal passage of watertight construction fitted along the centerline between the double-bottoms of some ships, usually from the forepeak to the forward machinery space bulkhead, used to carry pipe work along the length of the ship to the various holds or tanks?

Correct Answer: Option A — Duct keel

A duct keel, or pipe tunnel, is a longitudinal watertight passage located along the centerline. It provides a protected space for piping and electrical runs, allowing for maintenance and inspection without entering cargo holds or tanks, which is critical for vessel safety and system accessibility.