Without lockpick skill or the Carved Key (Swamp Temple) you cannot even leave the drop room. The Carved Key (Swamp Temple) can be found in a bunker not far from the dungeon at 23.8S, 49.6E. The doors have a lockpick resistance of 355.
The dungeon has three sections:
The top is populated by Mosswarts.
The middle is populated by Golems.
The bottom is populated by Sclavus.
In the mosswart section there is a door that leads to an area with a Mosswart Chief and a bunch of chests. It can only be accessed with lockpick (resistance 432).
Some Fire Auroch Meat can be found on the ground in a couple locations in this dungeon.
In the golem section there is a area where you will find a Lifestone. It is behind a door that can only be opened with lockpick skill (resistance 40). Also in the golem area is a Sho Roadside Portal.