You must have STEEL GIRDER and DEEP ROCK to make SUNKEN ANCHOR. You can find this item in face category. Plant it and come back tomorrow, unless you want to spent ridiculous amount of spray. Is this farmable? Good leveling up material if the answer is yes. Oops, there is no entry in the database about durability. If you know something, please share. There is no data about seedratio. There is no data about gemratio. Currently we do not yet have knowledge about the blockratio of SUNKEN ANCHOR.