Herb Schaltegger writes:

It's the same calculus used by people every day in every walk of life
for tasks ranging from the relatively mundane (like say hoping your car
doesn't break down crossing Death Valley in July) to out of the ordinary
(not carrying a pony bottle on a 110' wreck dive - most people don't -
and presuming your first stage won't fail because it never has before
and it's recently been checked out anyway)

110' ? bah ... 220' now you're talking.