Players who first stumble upon the Underground Passage in Baldur's Gate 3 will likely be using it as a quick way to travel between the Druid Grove and the Goblin territory. After all, that's what the Goblins are using it for. However, there is a treasure here for those who snoop around after taking care of any enemies.
Baldur's Gate 3: How To Get The Treasure In The Underground Passage
The Underground Passage in Baldur's Gate 3 is usually used merely as a Goblin route to the Druid Grove but there is a treasure here as well.
