A really good indicator that it's natural is there are other examples of these sharp right angle cuts along the shore. It's nothing special in this area. Hancock for whatever reason refuses to admit it's natural. Probably because he talked about how it was legit in one of his books and doesn't want to go back on his own claims.
yea i remember a jap scientist was like "it's cool it's underwater, but this is what the cliffs of yonaguni island look like" and i'm sure since it's underwater theres no wind erosion so all faults and cracks start out straight as shit, just like when you take a quarry slab, just that over a few thousand years wind makes those lines no longer straight.
its just a bunch of nothing.
www.sapiens.org
www.discovermagazine.com
there are other mass extinction event timelines before that, but nobody is willing to dig deeper than the 12k mark. its "established science" that 12k was when people crossed over the land bridge to the US. nobody who depends on funding is willing to rock the established science boat by looking for anything older. even though people have found much older artifacts in the US.
That's the end of the last ice age. Prior to that, most artifacts tended to be destroyed by the harsher conditions. After that, it's easier to get preserved.It's always 12000 years.
Ancient Artifacts Have Been Found in the Grand Canyon, Going Back 12,000 Years
Humans have left evidence of their passing through America’s great rift for more than 10 millennia.