E. Everett Evans 
The Planet Mappers [EPUB ebook] 

As he heard that dread yet telltale spang against the hull of their spaceboat, young Jon Carver dropped his reelbook and sprang to his feet. His eyes looked swiftly to help his ears trace the sudden hiss he knew was their precious air escaping. In the back of his mind he heard the sudden grunt his father made, the sound of a falling body, his mother’s frightened scream, and his brother’s ‘What’s wrong?’ But he did not stop his own lanky, gangling body in its leap toward the outer bulkhead. And as he jumped, he pulled his handkerchief from his hip pocket. ‘Leaping tuna! If that isn’t fixed quick, we’ll lose our air, ‘ was his near-panicked thought. ‘We won’t be able to get where we’re going. Be lucky if we come out of it alive!’ So, guided by the whistling, escaping air, Jon found the hole, nearly half an inch in diameter. Into it he wadded the corner of the cloth as best he could. The outward loss of their precious air slackened, although there was still some leakage he could not stop this way. He jumped to the nearest of the many emergency repair kits scattered about the ship. From it he grabbed a metal patch and an electric torch.
Swiftly he plugged the latter into a wall socket. With it he quickly welded the patch into place, after pulling—with considerable difficulty—his handkerchief from the hole. ‘It’ll do for now, ‘ he decided, after carefully examining his work and listening closely to make sure there was no more whistling-out of air. ‘But we’ll have to go outside and really fill in and weld-plug that hole in the hull, but quick.’
He re-stowed the torch, then opened a flagon of emergency oxygen-helium mixture in front of the electric blowers that kept their air circulating—to replenish what had been lost. Only then—although it had been less than two minutes, really—did he turn back to the rest of the family. He had been somewhat surprised that his father had not come to help him; he had not been at all surprised that his brother had not. Jak was a grand guy—Jon thought the world of him—but he just wasn’t worth a dead salmon in an emergency like this; he did not have a mechanical type of mind.
Now, as he turned, Jon saw his mother and brother kneeling beside the prone body of his father, and noted with astonishment that she was crying. There was something stiff and unnatural about the man’s body, too, lying there on the deck beside his recline seat.
A sudden fear sent the boy leaping across the room. ‘What … what happened? Pop isn’t dead, is he?’
‘No. Something made him fall, and he hit his head on the deck and knocked himself out, ‘ Jak said without looking up. ‘His foot caught in the footrest, and as he fell over the seat arm his leg broke.’
Jon dropped to his knees beside his weeping mother and threw an arm about her. His eyes were wide and damp with swift tears, for, in spite of the rapid growth his body had undergone in the past few years, he was still only sixteen—and he loved this splendid father of his with genuine devotion.
It just couldn’t be that Pop wouldn’t live, he thought in panic. He couldn’t make himself believe that he might no longer have the wonderful companionship and guidance and counsel of this grand man who had been his world.
His mother, seeming to realize what the boy was undergoing, forced back her own grief to turn and gather this younger son into her arms, comforting him as only mothers can…