Start Location: This pursuit is activated by looting a body in the HiddenTreasure place in the bay into the southwest of Svorlag on the island of Spikeroog.

You’ll discover a little island in the bay only north of the town of Svorlag. This is Guarded by 6-7 level 15 Drowners.

Wipe out them and loot the fellow’s body to get a Note and a Key with Ring Attached — this may activate the side-quest’Not Just Eagles Dare’.

Enter the water and dive under inside the search zone. Note there are numerous Sirens swimming round the world who are likely to attack — a crossbow bolt with kill them immediately, so be sure you keep it equipped.

Activate your Witcher Senses and look for a chest underneath the water near the island, just to its southeast. Use the Key to unlock it.

This will complete’Not Only Eagles Dare’ and by looting the contents, you’ll be rewarded with some goodies (I received a brand new chest and thighs ).

Looting this may also end the side-quest.