Underwater tunnel

Relavent features: UT1: always has a "+" shaped room with stairs up and a lantern. UT2: always has two up stairs (to UT1 and UT3), and a large room with a diamond-shaped block in the middle. Inside the block are down stairs to UT4. Always very long horizontally. UT3: always has a square room with a grass floor and up stairs to wilderness. Genetrix Versana the Mother Carniverous Plant always spawns over the stairs. As long as she is alive, carniverous plants of various sizes will often spawn in squares adjacent to you. UT4: always contains 3 golems, one of each of the colors of light crystal. Also contains an altar to Silva. Many crystal growths can be found here of the 3 colors of light crystal. Bears are also common here, as are spiders.