Lakebed Temple

Lakebed Temple, also known as the Zora Temple, is the third dungeon in.

Entrance to the Temple
The dungeon is located at the bottom of Lake Hylia, and as such, Link can only gain access to it after both acquiring the Zora Armor in Kakariko Village and purchasing some Water Bombs, as the entrance itself is blocked by a boulder.

Themes and Navigation
The temple is based around water and appears to be a spiritual successor to the Water Temple of, but instead of level manipulation, the dungeon's functionality is actually based on the transport of water from its sources to dried rooms. Notably, several rooms contain large ancient gears and waterwheels, which, albeit not to the same extent as the complex machinery found in the Goron Mines, seem to show an advancement in technology since the events of Ocarina of Time.

This temple's greatest feature is its rotating central staircase, which must be turned to move streams of water in the dungeon. Using different handles and mechanisms, Link must bring the flow of water to move waterwheels and platforms to advance deeper into the temple. Link's main goal is to get the water level in the rotating central staircase room high enough to reach the boss door. During the exploration, he also must frequently shoot Bomb Arrows to bring down some stalactites on the ceiling, so that he can climb up to some spots. The item Link receives in this temple is the Clawshot, needed to reach to otherwise inaccessible places. It is acquired after defeating the temple's mini-boss, the Deku Toad.

In terms of structure, the Lakebed Temple resembles the Fire Temple from Ocarina of Time, having multiple floors and the highest rooms being parallel to each other, as if the two main sides of the temple (west and east) were intended to have a symmetry. A notable difference, in comparison to the aforementioned Fire Temple, is that Link has to fully explore both sides to clear the dungeon, whereas the eastern highest-end rooms of the Fire Temple are optional.

The final boss of the temple is Morpheel. The boss is found after Link descends while swimming through a long shaft leading to the battle arena. Upon clearing the dungeon, Link receives the third and final Fused Shadow and another Heart Container.

Trivia

 * The background music in the Lakebed Temple is, in some ways, thematically similar to that of the Water Temple of Ocarina of Time.
 * When Link speaks to Midna, she initially admires the beauty of the dungeon and considers the place to be better than the Goron Mines; however, after some time, she changes her mind and complains about the complexity of the temple.  This may be a reference to how previous water dungeons in the series were similarly complex in structure or in the need of manipulating water, as well as directly referencing the number of keys needed in Ocarina of Time's Water Temple. Despite her complaints, there are no grand searches for Small Keys beyond the first.
 * It is possible to perform a Big Key skip for the Lakebed Temple, as the boss door itself does not actually lead directly to the boss chamber (Link must drop down a hole past the door).