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Worst bit for me was reading it can only be opened from the outside....
Perhaps counter intuitively this is actually very sensible.
When people are trapped in a small space underwater and panicking the urge to open the hatch - however illogical - is very strong. What of course would happen is as soon as any water got in you'd get cut you in half if it hit you as it's under such high pressure, before the sub flooded and you'd drown anyway.
There was a very compelling interview with Dr Michael Guillen on PM on BBC R4 yesterday (from 48 mins) which covered this:
https://www.bbc.co.uk/sounds/play/m001n1r3He was the Science Editor for ABC at the time (2000) and he was the first journalist to report from the wreck, despite having a fear of water. The sub got stuck when it fouled the Titanic's prop in 2000 after being caught in a fast-moving underwater current.
Worst bit for me was reading it can only be opened from the outside....