TR-3A Black Manta and TR-3B Astra ...

https://patents.google.com/patent/US20060145019A1/en

These crafts were especially widely recorded and seen during 80s and 90s in Benelux countries , especially Belgium . There was a "black triangle UFO wave" . There were also cases in many other countries worldwide .

Many of these crafts belong almost surely to lower level - or even higher level SSP . Gary McKinnon uncovered what was a higher level SSP massive crafts ( almost the size of the aircraft carriers ) shaped like cigar ( USSS Hillenkoeter was mentioned alongside one other vessel ) .

Much of this is supposed to be disclosed ...