The Sea Shrine is filled with various hourglasses. If any hourglass other than the Hourglass is tampered with, the temple's ceiling disappears, and the temple will flood and be rendered inaccessible. This is shown when Amethyst grabbed the wrong hourglass in "Steven and the Stevens".
According to Pearl, the Sea Shrine reforms every 100 years after being flooded with water.
- According to Pearl, the Sea Shrine fell apart before "Steven and the Stevens" in one or more previous attempts of the Gems to locate the correct hourglass.
- In "It Could've Been Great", while Peridot talks about the colonization plans for Earth, schematics for the Sea Shrine are briefly seen on the Moon Base computer display.
- It is unknown under which specific ocean the Sea Shrine resides.
- The riddle of having to pick the correct hourglass among many different ones, or face dire consequences is a reference to the movie "Indiana Jones and the Last Crusade" in which the characters have to make a similar choice involving the Holy Grail.