Dive from the South China Sea, go through the Western Pacific Ocean, Indian Ocean, Red Sea, Mediterranean Sea, to the Atlantic Ocean. The colorful underwater visual effects of the underwater tunnel and the oversized curved acrylic display window lift the mysterious veil of the ocean. 37 exhibit tanks show visitors the most representative ornamental fish of the earth's waters.

Main exhibits: whip butterfly, longnose snout, multi-banded butterfly, paramecium, sea anemone, seahorse, yellow highfin spinytail, blue-green light gill, bluish butterfly, sickle butterfly, bullhorn, six-spotted spiny triggerfish, coral, grouper, stone fish, triggerfish, heart-spotted spinytail, clown fish, panda dragon, doctor fish. There are dive feeding shows at the entrance of the Undersea Tour at 10:00 a.m. and 1:30 p.m. daily (except Tuesdays).