Mir reenters the atmosphere and breaks up.

Larger spacecraft might not completely burn up on reentry and could be a nuisance—or worse—if they were to strike populated areas.

Reentries of very large satellites must be carefully planned.

The most famous planned "fire-fall" was that of Mir, the Russian space station. In March 2001, after 15 years and 86,000 orbits, the old space station plunged safely into the south Pacific Ocean.