The Man Who Lost the Sea by Theodore Sturgeon

The Man Who Lost the Sea by Theodore Sturgeon (F&SF, October 1959) opens with a boy annoying a man who is half-buried in sand with explanations about how his helicopter works:

He doesn’t want to think about flying, about helicopters, or about you, and he most especially does not want explanations about anything by anybody. Not now. Now, he wants to think about the sea. So you go away.
The sick man is buried in the cold sand with only his head and his left arm showing. He is dressed in a pressure suit and looks like a man from Mars. Built into his left sleeve is a combination time-piece and pressure gauge, the gauge with a luminous blue indicator which makes no sense, the clock hands luminous red. He can hear the pounding of surf and the soft swift pulse of his pumps. One time long ago when he was swimming he went too deep and stayed down too long and came up too fast, and when he came to it was like this: they said, “Don’t move, boy. You’ve got the bends. Don’t even try to move.” He had tried anyway. It hurt. So now, this time, he lies in the sand without moving, without trying.  p. 259 (The Year’s Best SF #5, edited by Judith Merril, 1961)

After this we learn that the man isn’t, for an unspecified reason, able to think straight, and his inchoate thoughts wander from a childhood concussion in a gym class to observations of his local environment—these include what he thinks is the sea in front of him—before moving on to an attempt to calculate the period of an overhead satellite. During these various thought processes (spoiler) it seems he may be somewhere other than Earth.
The next long section is a formative episode from the man’s youth, when he got into difficulties in the sea while snorkelling and almost drowned—all because he panicked but was reluctant to call for help. He then thinks about the kid with the helicopter, which makes him recall another model, one of a spacecraft that had several stages. Then he notices that the satellite is just about to disappear, and his final calculation of its period confirms where he is.
In the last section of the story he recalls the spacecraft again, but the real thing this time and not the model, and how the final two stages, Gamma and Delta, crashed onto the surface, ejecting a man to lie among radioactive graphite from the destroyed engine. Then the sun rises, and he realises that there isn’t a sea in front of him:

The sun is high now, high enough to show the sea is not a sea, but brown plain with the frost burned off it, as now it burns away from the hills, diffusing in air and blurring the edges of the sun’s disk, so that in a very few minutes there is no sun at all, but only a glare in the east. Then the valley below loses its shadows, and like an arrangement in a diorama, reveals the form and nature of the wreckage below: no tent-city this, no installation, but the true real ruin of Gamma and the eviscerated hulk of Delta. (Alpha was the muscle, Beta the brain; Gamma was a bird, but Delta, Delta was the way home.)  p. 269 (The Year’s Best SF #5, edited by Judith Merril, 1961)

He realises that this is his spaceship, and it crashed on Mars. He also realises that he is dying but, in his last moments, he rejoices that “we made it.”
This story may appear to have a slight narrative arc but a plot synopsis isn’t much use in an appreciation: what we really have here are a number of well-written and intensely evocative memories and scenes that are slowly brought into focus to reveal what has happened to the man. It’s an accomplished piece and, in terms of technique, atypical for the period.
***+ (Good to Very Good). 4,950 words. Story link.