08/20/2026
There's a lot going inside Cod's superstructure ... that mysterious area below the steel and wood deck and above the pressure hull. This area contains vents and vent riser pipes, line lockers, mufflers and air induction piping. Those vent riser pipes allow air trapped in the ballast tanks (when surfaced) to escape and allow water to enter the ballast tanks to dive. The risers exit the tanks in a V-shaped channel running most of the sub's length. But the channels, called waterways, hold rain water. The bottom of the risers sitting in the waterways can rust out over time and allow water to enter ballast tanks. We've been working on repairing those rotted pipes and are in the words of former Navy hull tech and project supervisor Lou Vertosnik, "about halfway through."
We started at the bow and worked aft. Since the deck tapers down towards the stern, we are now working in an area that is getting more and more cramped. And to further complicate things, some vent risers are located under Cod's four massive engine mufflers. Thank God for our younger crewmen who have been crawling into the dirty cramped spaces to remove and later install the repaired risers. You will never notice this vital work directly, but keeping Cod upright on a zero bubble is very important! My thanks to Andrew Watkins for most of the images here.