Neat story!
It reminds me of Tikal National Park and Mayan ruins all across Central America. There are these massive hills in an area that is usually flat, and they are Mayan temples underneath! Mother Nature has just reclaimed the area. A similar thing happened to cars left behind post Fukushima, nature began to grow into them. Anytime we leave something behind and don't bother it again the earth begins to reclaim the space.
It's pretty cool to see that in a marine context at that large of a scale! Thanks for sharing!