Had to check Wiki on that. The Trieste reached the bottom of the Marianas trench; i.e., 6.78 miles down. So the Nereus didn’t make it that deep, which is a serious engineering embarrassment, as far as I’m concerned, given our 50 years’ metallurgical advancement over the old timers.
“So the Nereus didn’t make it that deep, which is a serious engineering embarrassment, as far as I’m concerned, given our 50 years’ metallurgical advancement over the old timers.”
Nereus also dived in the Marianus Trench and reached a comparable depth of 10,902 metres (35,768 ft) to the revised Triests dive of 10,916 metres (35,814 ft). So, Nereus did “make it that deep” given the inaccuracies of measuring the actual depths of the dives.