Given that it's named the "Titan" and described as "the world's only privately owned manned-submersible capable of reaching Titanic depths of 4000 meters" [1] I suspect this was designed with the Titanic in mind.
You would hope that would include a substantial safety margin.
You would hope that would include a substantial safety margin.
[1] https://www.youtube.com/watch?v=vNHXqOUtxgw