We may need an international, worldwide sensor network in order to collect and filter endless amounts of data, while looking for the anomalous. This would include submerged sensors, surface sensors, and space, in as many frequencies as is feasible across the em spectrum.
It’s a daunting project. But even if there were not any anomalies, such a giant sensor array can probably be justified for general purpose research.
I don’t know how forthcoming any branch of the military can ever be. They have institutional reasons to be cautious and cagey with any info that is thought to lead to a military advantage.
That’s why we get a slow drip of information like, “yes, something we don’t understand does exist…” and that’s it. If we want more than that, we probably need a collaborative privately owned sensor network, or a major white house lawn landing, or a major NHI action like abducting half of the NYC, something absolutely undeniable and absolutely unignorable.
The way things are now imo will also lead to some disclosure, eventually.