I was on an April 2015 deep diving expedition to Sudan to locate the missing WWII Italian submarine Macalle. Despite several of us doing multiple dives below 100m, the location of the sub remains a mystery due to the reef walls dropping straight down to well over 200m and out of diver and sonar range. One diver even scootered across a side of the island at 208m (seven hours in the water!) without seeing the bottom. It was still a fantastic trip with lots of sea life and time with great people.
Here’s Simon Taylor-Watson’s report on the expedition, and I’m working on a video of the trip.