Money talks and BS walks.
I estimate 500 million dollars of research, programs, investigations and reports have been devoted to this subject.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7514271/
Flight characteristics of UAPs usually have an ionized air glow around them. Brightness can vary. Travel is slower in the sea but still a factor of 10 or more compared to known vehicles. There seems to be elements of a controlled technology that encompasses both mass and energy as well as space and time manipulation.
These differences have been delineated since 1954 yet we still do not have a public explanation. Aerodynamic shapes are not required since there are no lift or propulsion requirements. Size can vary from 6 meters to over a mile.
https://www.dni.gov/files/ODNI/documents/assessments/Prelimary-Assessment-UAP-20210625.pdf
https://www.cbp.gov/sites/default/files/assets/documents/2023-Aug/Records%20pertaining%20to%20Unidentified%20Aerial%20Phenomenon.pdf
https://pubs.giss.nasa.gov/abs/st02710y.html
https://that1archive.neocities.org/subfolder1/ufo-files