On Today in Tabs, Rusty Foster has a good backgrounder on the Titanic submersible:

Ok look, in my spare time I do volunteer wilderness search and rescue, so I am the last person to look askance at anyone for doing stupid things in the name of pointless adventure. If your soul calls you to risk death on a mountain in Maine, I will do my best to reach you in time, and if it calls you to die in a carbon fiber and titanium can at the bottom of the Atlantic, I will salute you and hope for your sake it was a hull breach, comrade. 🫡

Much of it is in the form of a FAQ:

Is this submersible, like… safe?

Lmao no….

Mitch Wagner @MitchW