In the 1.2.0 update, a pile of construction materials, including a crate, wooden posts, a tube, and a lantern was added by the path which would later lead to Mt. Blizzard. In the 1.3.0, the materials were removed, and the path since connects through a tunnel to lead to the aforementioned zone.
The Sea Caves was one of the original three zones in Club Penguin Island. In the 1.0.1 update, the lighting of players in the zone changed, and players since appear darker.
In the 1.2.0 update, a stone sign displaying emojis that correspond to air bubble levels was added to the entrance directly below the water's surface. Additionally, multiple parallel facing air vents were added to areas of the caves where air does not deplete, such as Glow Grotto.