The collapse was caught on a permanent camera. Theis YouTube video then ends with drone footage of the wreckage:
Guess it's pretty obvious now why it is being decommissioned.
To be fair it has been operating since the 1960s and has more than justified it's cost. This is where gravitational waves were first indirectly detected in 1974 - which means a lot to physicists as it was the final missing link to the Standard Model of Particle Physics (I wont go into too much detail). There is a replacement l
arge-aperture radio telescope located in China that came online in 2016, and at 500m diameter is a fair bit larger than this one.