Bathyscaphe Trieste
On 23 January 1960, she reached the ocean floor in the Challenger Deep (the deepest southern part of the Mariana Trench), carrying Jacques Piccard and Don Walsh. This was the first time a vessel, manned or unmanned, had reached the deepest known point of the Earth's oceans. The onboard systems indicated a depth of , although this was revised later to ; fairly recently, more accurate measurements have found Challenger Deep to be between and deep.
USS Atlanta (CL-51)
In the following years, Denlay and Tysall mounted several larger expeditions to survey "Atlanta", exploring and videoing the wreck in detail to a depth of at the bow. The civil unrest in Solomon Islands from late 1998 prevented further diving around Guadalcanal for several years. However, on the final expedition that year, the then deepest wreck dive by a woman was made by Kevin's wife, Mirja, on "Atlanta". Denlay's last visit to the wreck was in 2002 using a closed circuit rebreather or CCR, the first CCR dive on "Atlanta". Since then, very few dives have been conducted on "Atlanta", although in May 2011 a very experienced deep diving team from "Global Underwater Explorers" successfully videoed the wreck for documentary purposes, the first survey of the wreck since Denlay's expeditions up to 1998.