What on Planet Earth

I was looking with Google Earth at the bottom of the Black Sea for clues to prove my theory the asteroid that formed the Carpathian Mountains landed there. But now i ran into something even more exciting. Some weird features on the bottom of the sea. Exactly 7 km wide "highways" running in all directions. And some "dots" that seem aligned. First i thought, like any normal person would, it was the Russians who did something weird on the bottom of the Sea.

So i ran and looked in other seas. Pretty similar stuff in Marmara Sea.

But it was in the Mediterranean where i found the really weird stuff.

The lost city of Atlantis, north of Libia?

Then i went to North Atlantic Ocean, east of Canada. These are 14 km wide. A grid. Fuxi and Nüwa rebuilding the Earth with a square and a compass?

Did not memorize where i took this one, can use coordinates.

West of Tasmania.

My guessing expert guess? It's ancient mining. Some tenth of million years ago. Scooping something from the bottom of the ocean that fell from exploding meteorites. An ancient alien underwater city north of Libia? (Atlantis maybe?) Needless to say. I'm not the first one who see these things. So take another shock. It's been covered. They waited for someone to run into it accidentally?

66 million year ago. They throw a metal asteroid at Earth, causing a mass extinction event that killed all the dinosaurs, many other species. Then they come and build these huge skimmers and skim the metals fallen on the bottom of the seas. Then somebody else throws one on them? like in 2nd picture above?

I believe we're facing all these problems because we live on a planet. Maybe we too should go and build a huge cylindrical whatever, park it near Mercury or Mars and visit planets only for resources?