An oceanic question

[BrianSoddingBoru4]

The Challenger Deep is the deepest known area of the ocean.

But I was just thinking, is it at all possible for there to be parts of the ocean where there is no bottom seabed? Is it possible for the ocean to span downward all the way to the opposite side of the globe?

I am being dead serious, and not trying to offend or embarrass you or be mean.

I am honestly wondering where this thought on your part originated from as a possibility. 

The truth in reality, is that earth's core is molten. It is hotter than heck, and the only reason humans don't burn up on the surface, is because we have a crust that protects life from the core heat. But we have "plates" being of crust, that float on that molten core, and over time, those plates bump into each other and cause volcanoes and earthquakes. 

But it isn't Hollywood. It isn't a magical geological process that gets solved in an hour and a half or 2 hours. Geology and astrophysics are a study of over interaction over geological time over millions and billions of years.

Earth is only one example of the evolution of our solar system. But big gas planets like Saturn and Jupiter, do not have the same makeup as earth.

Actually, the inner core is solid, the outer core is what’s molten. The tectonic plates ride on a partially molten part of the mantle, called the asthenosphere, not on the core.

Boru