One interesting difference to note on the Deepsea Challenge: Unlike the
link Sea-Dweller or Deepsea, it doesn't
link have a date. Unlike the Sea-Dweller, which was originally designed for divers who'd hang at the bottom of the ocean for days at a time at a SEALAB, the Deepsea
link Challenge is designed for short-term deep diving like Cameron's adventure to the bottom of the Mariana Trench – no need to know the date when you're merely testing the limits of humankind (and watchmaking) for a few hours at a time.