The Way to Amalthea

A cargo spaceship, propelled by a photon engine with a large reflective mirror ("sail"), visits the Jupiter system to deliver cargo to a staffed science station on Amalthea. Damaged by meteorites, the spaceship falls into Jupiter but survives the pressure and floats in the dense atmosphere. The crew manage to work around the damaged mirror and start the main engine to escape Jupiter and finally reach Amalthea.