I'm trying to remember the name of a live action show I saw on Canadian TV in English in probably the early 90s. It was probably a kids show. It was fairly low budget, about a group of people stranded on some kind of space station or facility built into an asteroid, on either one of the Martian moons or an asteroid. I'm pretty sure asteroids was related, because they were in caves (as opposed to some kind of built structure) during much of the episode I saw. There was gravity, which suggests either it was a very large asteroid, or they just skipped over that problem because the budget was so small. I think the main characters were 3 teens; two teen brothers and a unrelated teen girl. The girl was wealthy or from a powerful family, although her money was of no use in their current situation, and her snobbishness was a source of friction. I'm fuzzy on this but I think the boys were Caucasian. I am even less certain about the girl's ethnicity. There were other adult characters, but I can't remember any details.
I think later on in the series they broke off a piece of the space station and used it as a makeshift spaceship to start travelling back to Earth. The episode I saw was an early one, where they are still struggling with surviving some recent disaster that has made their survival doubtful and damaged the integrity of their environmental systems.