Some pages ago someone wanted som number crunching: forces needed, etc. I can't find that post right now, but here are my attempts.
Case scenario: (all numbers taken from
Airbus A320 family - Wikipedia, the free encyclopedia)
ASSUMPTION: A320-200 flying at cruising speed 828km/h and 11000m with total weight 78t = 78000kg.
Climb 2000m in one minute = 33,333333m/s = 120km/h
828km/h = 230m/s
Baseline kinetic energy = 2,06e+9 Joule (Nm)
Work needed to lift airplane 2000m = 0,64e+9 Joule (Nm)
Interesting fact is that max allowed speed for A320-200 at 11000m is 871km/h and if some of those 120km/h updrafts added a forward component, an overspeed scenario is likely.
I have deliberately calculated with the max allowed weights and cruising speeds, anything slower and lighter than this would of course be greatly beneficial. I did not calculate any inertia because this would be much too complicated and I really don't have time today.
EDIT: I am very happy to see the Indonesians work so tirelessly and be so committed to this. Awesome effort by the divers, I really hope they get recognized for the extremely dangerous and mentally exhausting work they do. I wonder if there is some way to show appreciation from around the world to those guys.