https://historysnacks.io/event/HTZerxzL/two-satellites-an-iridium-communications-satellite-and-a-defunct-russian/
2009 Satellite Collision: When Orbit Got Crowded
An Iridium satellite met a dead Russian one at 26,000 mph. The debris cloud became a warning for every spacecraft after it.
satellite collisionorbitgotcrowded