The Top Secret UK Condign report released under the freedom of information.
https://archive.org/details/condign-vol-2-1-258/Condign_Vol_2_1-258/page/n68/mode/1up
Basically it states thst the UK has known that UAPs are real for a long time. Human exposure to their energies is hazardous and should be avoided. Milirary experiments are underway to replicate some of them for weapinization. No known technologies exist the describe how UAPs function. Ball lightning is described in extreme detail but does not explain what UAPs always are.