I believe that DrAsimov refers to "Requiem," Heinlein's 1940 short story and (although it was written before the larger work) MWSTM wrap-up. Citing R.L. Stevenson's auto-epitaph:
"Here he lies where he longed to be
Home is the sailor, home from the sea
And the hunter home from the hill."
Highly recommended and readily available. Given the importance and familiarity of this story, it seems nearly certain that someone involved in the scripts had it in mind.
Re all the "realistic or not" argument: it's only a movie. There are many technical implausibilities made from ignarance, FX and other practicalities, need to support the plot, etc. If SF movies had to be perfect - in the sense of containing nothing not known to be impossible - there wouldn't be many of them. And on a more abstract level, a lot of great science and engineering is achieved by setting aside perceived impossibilities, defining an objective, and then innovating around barriers. Cf. the "ultraviolet catastrophe" as an inspiration for statistical mechanics.
As to panting oneself to death, specifically, space aeration is not quite like a locked closet. Rather, as with underwater rebreathers, it separates resupply of oxygen from scrubbing of CO2. CO2 poisoning is NOT pleasant; it's high CO2 concentration that triggers panting, and symptoms prior to unconsciousness can be very uncomfortable. (Been there...) However, anoxia (low partial pressure of O2 in the absence of toxic gases) need not be unpleasant. Take a few deep breaths from a helium balloon - out like a light, no discomfort except hitting head on floor. It's one of the reasons that closed-compartment industrial work can be so dangerous, and is strictly governed by rules about multiple persons on watch, pull-out ropes etc. - too easy to climb into a nitrogen-purged tank and pass out before knowing there's a problem.
Personally, I agree with those who see final scene - with no FX for the long float and sudden stop as leadup - as a pleasant fantasy for both the survivors and Hawk himself as he sails off into the deep. And beautifully rendered, visually and musically. And possibly a reference to that prior classic with similar plot elements but a slightly darker ending, "We'll Meet Again" in Dr. Strangelove.
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