Der Test zum Abbau seltener Erden in der Tiefsee erweist sich als erfolgreich

Not sure what was „successful“. If they were able to find rare earth or if they were just able to mine earth from under 5,700 meters underwater.

EDIT: Checked the following article too and they were able to retract rare earth but not yet certain what kind of rare earth it is.

>   The sediment will be analyzed to determine what rare earths it contains and how much of each.

[Japan Successfully Retrieves Rare Earth-Rich Sediment from Seabed](https://sp.m.jiji.com/english/show/45504)