How deep can the ocean plausibly be?

I want to have planet with as deep an ocean as plausibly possible. How deep can I go given these restrictions?

• Planet must be in habitable zone of a star
• Generally, planet should support life
• Size of planet not decided, but I have general idea of something "really big" (Jupiter size and bigger)
• I do not plan any life on surface, so continents are not required
• Planet should have atmosphere

Edit: After first two answers: I define "ocean" as "something you can swim through". (If I had scuba suit made of unobtainium to help me survive the pressure, how deep plausibly can I dive?)

posted over 8 years ago

Pavel Janicek‭

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