There has to be a balance with anything like this whether it's land, sea or air.
If FellTop goes missing on Ben Nevis there's a rescue procedure that's been established for decades. It's there because 150,000 people climb it every year with only two or three deaths so as safe as staying home doing DIY. The rescue cost is nothing when compared to the huge amount brought in by the associated tourism, jobs, etc. Those on the rescue teams are fellow climbers who know the mountain blindfold.
This submarine escapade could never be worth the risk of having a dozen boats, and various aircraft, searching for days in hostile conditions. The risk to human life was significant and the cost enormous.
There was no rescue procedure, the owners just expected the Canadian/US Navy, and air forces the coastguards, private vessels,etc to jump when they snapped their fingers.
There's no balance of worth against consequences ....
... it was a jaunt and not worth doing, you can see what they might see, in a few seconds, by Googling 'Titanic'.
Edit: Seven seconds as it turns out.
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