Or as theorized, a sudden blast of energy such as a Nuclear device or extremely powerful Radar could disrupt their technology and crash them.
It is interesting that the peak period for UFO crashes in the western US was in the late 1940s into the 1950s and early 1960s.
Ref:
https://archive.org/details/ufo-crash-retrievals-status-reports-1-vii
One hypothesis is that a lot of new radars were being tested at that time—with a variety of different effects.
Those were highly classified projects at the time.
https://en.wikipedia.org/wiki/Over-the-horizon_radar
Or what about this:
UAPs' persistent interest in nuclear sites suggests nuclear reactions may do more than release energy—they could briefly tear space-time, creating interdimensional openings. If the positive energy released here is mirrored by negative energy in a parallel dimension, that negative energy might be harnessed to generate warp bubbles.
This could explain why UAPs appear at these sites: they're not just observing us, but possibly using nuclear events as gateways or fuel sources for interdimensional travel.