you dive down underwater and you go into a cave
you can't
It's an underwater cave at Poseidon's "castle"
The Hydra is a six headed beast on Poptropica.
you go to the beach and there will be a sine that says gnarly monster, you go under the water. there will be bubbles .collect them to get more breath. when you are to the bottom of the sea. you will see a cave. go in to find the hydra.
you have to jump on all 5 of the hydra's heads and then click on the hydra and you will get the scale
Jump on their heads.
The Hydra is in his underwater lair. Swim out from the beach to the underwater maze, then go right, down, and left to find the Giant Pearl and the entrance to the Hydra cave.
The hydra is underwater in Posidons temple/house. Once you get inside the house there is a big "pool". You can go to the one area and there is an opening. The hydras at the end of a maze underwater.
When it tries to bite you, jump, and land on its head.
Defeat the hydra who is found in a cave in the bottom left of poseidon's water maze.
Move your mouse over the neck of the hydra and wait till it makes the pointing finger. Click
To get the Hydra scale on Mythology Island in Poptropica, you need to defeat the Hydra by using the arrows to hit its heads. Once you successfully defeat the Hydra, one of its scales will drop. Approach the scale to collect it, and make sure to explore the surrounding area for any additional items or tasks you may need to complete on the island.