What do you think is the most fascinating about the ocean?

Question: What do you think is the most fascinating about the ocean?
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  ocean
Asked by mikey to Ryan on 20 Jun 2011.
- Ryan Ladd answered on 20 Jun 2011:
  
  Ever since I was little I’ve always thought the animals which live in the ocean are totally amazing. We have these awesome movies about aliens and monsters but the ocean contains some creatures even more strange than anything imagined by people!
  
  I love seeing films or reading about animals from the ocean, especially the deep sea, from octopus’ which can instantly change the colour and texture of their skin to look like rocks or plans to a very very weird relative of jellyfish called siphonophores (do a search for some pictures!).

Question: What do you think is the most fascinating about the ocean?