The orbiting command module of a crewed Mars mission of 2032, swallowed with its pilot Lieutenant John Kelly by a graviton ellipse and found by Voyager in 2376.
Ares IV was one of the early crewed missions to Mars. On 19 October 2032, while two astronauts worked on the surface, the command module in orbit, flown by Lieutenant John Kelly, was engulfed by a graviton ellipse and vanished. His colleagues waited weeks for rescue.
The Voyager episode One Small Step shows what became of it. In 2376 the ellipse emerges near Voyager in the Delta Quadrant, and Chakotay, Tom Paris and Seven of Nine take the Delta Flyer inside. They find the module intact.
Kelly had lived on for some time, recording what he saw, including debris from other civilisations. Seven beams aboard to salvage a part needed for the Flyer's escape and brings back his logs and his body, which the crew commit to space with honours.