This is part three of the Anton deGama story, Black Ice. Anton's crawler is sliding towards a deep trench on Titan, and Anton is starting to panic...
Anton clambered up into the crawler's tiny, squat turret, and looked around. With the benefit of the additional height, he could see the narrow scar of the drop-off, even through the howling methane wind. He had maybe a minute.
He glanced up the slope. There was still a considerable mass of permafrost cascading down behind the crawler. Anything to stop the crawler would have to stop the black ice, too. The comm laser could not melt away that much ammonia.
He looked round wildly for any type of outcropping that he could try to get to. Nothing. He knew he should have stayed in space. He was a ringminer, not a groundhog repairman!