As a tech diver, the Doria will never be an option for me, for a few reasons: 1. I started diving too late in life. I am past my prime. This is a serious dive that requires serious training, planning & execution, with such adverse conditions. 2. I am not much of a wreck diver,.... my passion is the caves. 3. To do the dives, it requires hypoxic Trimix, not by much, but yes, it does. I live too far inland for hypoxic trimix to be an option. There needs to be ample practice diving the mixes & here in the mid south/ west, there really is not anything available deep enough within a reasonable drive. Although I will likely pursue normoxic trimix in the near future, because I can practice those skills close by,..... I have come to realize what/ where my limitations are. For those who want to & can do dives like the Doria,... Please follow your dreams with proper training & mindset. Dive safe my friends.