Bathyscaphe Trieste
Trieste is a Swiss-designed, Italian-built deep-diving research bathyscaphe, which with its crew of two reached a record maximum depth of about , in the deepest known part of the Earth's oceans, the Challenger Deep, in the Mariana Trench near Guam in the Pacific. On 23 January 1960, Jacques Piccard (son of the boat's designer Auguste Piccard) and US Navy Lieutenant Don Walsh achieved the goal of Project Nekton.
Cheyenne (catamaran)
In 2009 Cheyenne was purchased by Chris Welsh from the estate of Steve Fossett. Plans are to launch a deep sea submarine to carry passengers to extreme ocean depths. The deep sea adventure will be supported by Cheyenne, and will use the HOT DeepFlight Challenger sub to plumb the depths of the worlds oceans to full depth. Both of these were owned by Steve Fossett, who had modified the racing catamaran to become the mothership to his oceanic dive record attempt. The submarine seats one person, and is currently the only manned submersible capable of reaching the deepest part of the oceans.The former records have all been broken.