The Triton Abyssal Explorer (AE) is a two (2) occupant submersible vehicle designed and certified to operate safely, reliably, and repeatedly to a depth of 4,000 meters. Just like all Triton submersibles (with the exception of the full ocean depth rated 36000/2), the AE has a transparent acrylic pressure hull which is subject to the requirements of the ASME PVHO-1 Safety Standard. 4000 meters is the maximum depth limit of a two-occupant transparent acrylic sphere submersible vehicle using the design criteria of the PVHO-1 Safety Standard. This paper describes some of the AE’s innovative design features.