Closed chest. where is the key? (The Witcher 3: Wild Hunt)

kolinzu
I saw this chest, but it’s not from the mission, you swim out of the cave and there is a portal to the ruins

kolinzu
and 1 more advice there will be a bunch of portals and to save time go to those that the statue is looking at
(there is no statue on the mountain) XD

I went through the portals and found the laboratory. only it is not clear what kind of chest it is and where to look for the key to it

kolinzu A
question near this place. Mini-quest with hidden treasure.

Marty52
mmm yes you can check (if you can throw the screen somewhere)

Marty52 the
nest of monsters is there, I took some book from the corpse, but the new quest did not appear
Spoiler

Gena Troshev
kolinzu
Rebzya, the PG has broken a little and now I cannot upload a screenshot. If you have already found the "Dungeon" loka, then there is just one question. If not found, then this location is located east of the port of Bockler. The location is a small island.