The vortex spotted in the reptilian origin project raised this idea in my mind. There have been speculations that the black holes themselves could be some sort of portals due to what they do to space time, the only tool we have available I am aware of today to verify if this is true even in part or not is remote viewing.
Hence I propose the "Inside of a Black Hole Event Horizon" project. Some important aspects to take into account:
1) Which black hole or black holes to target. I suggest the actual closest black hole to Earth (regardless of it being known or not and its category), the V Puppis system and its black hole (currently the closest known stellar mass black hole from Earth), Sagittarius A* from the center of our galaxy (closest supermassive black hole) and the Phoenix Cluster (SPT-CL J2344-4243) which is a galaxy cluster with the largest known X-ray luminosity of any cluster and the theorized most massive black hole known to this date.
1.1) Optional: If primordial black holes exist and how similar they are to the other categories.
1.2) Same as above but for intermediate mass black holes.
2) How a remote viewer perceives the length in space, at a fixed moment in time, between the event horizon and the singularity.
3) How a remote viewer perceives the flow of time inside the event horizon at fixed points in space. For instance, close to the event horizon limit, at half of its radius and near the singularity.
4) The singularity itself (the point where all the mass is).
5) If it links to somewhere else, or rather, what happens to the fabric of space time itself.
5.1) If it links to somewhere else then if it can be used as a portal or if it has been.
5.2) How correlated are space and time outside of the two ends. As in, if the space time is the same differing only upon coordinates or if it is a distinct space time (or parallel universe) or something else (some weird space time fabric correlation).
6) Naked singularities. If they exist and what they look like if they do.
7) Black hole remnants. If primordial or very small black holes do exist then some may have already evaporated, then what has been left from them if anything.