Nonetheless, bad things happen. A robot may be dropped and it may break into pieces. A new ``enhancement'' turns out to break a lot of existing code. An upgrade of the compiler no longer compiles your program. Although you can avoid most of these situations by being careful and preparing for the worst, you can still, though rarely, get into hopeless situations.
For micromouse projects, it is important not to panic and stay cool. Panicing is not going to help anything, so you might as well try to remain calm and approach the problem methodologically. There will be pressure, but you need to focus on the work, and not the pressure.