The Mermalair in Mermaid Man and Barnacle Boy III.

The Mermalair is the secret lair of Mermaid Man and Barnacle Boy in the Nickelodeon T.V. Series, Spongebob Squarepants. It is located under Shady Shoals Retirement Home.

The Mermalair in Battle for Bikini Bottom.

It is not a primary location in the series only appearing in six episodes, Mermaid Man and Barnacle Boy II, Mermaid Man and Barnacle Boy III, Mermaid Man and Barnacle Boy V, Shuffleboarding, Back to the Past , and Mermaid Man Begins. It appears largely in the video game Battle For Bikini Bottom being a level with five different areas. It is also used as the location of Gill Hammerstein in the video game Lights, Camera, Pants!.  Items such as the orb of confusion, the invisible boat mobile, and the aqua glove are stored here. The Mermalair has never been destroyed in the series, though it is possible that it was destroyed in the adventures of Mermaid Man and Barnacle Boy T.V. Series. 

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