We know more about the surface of the moon then about the deep ocean (and not only the bottem, the part between the bottom and the surface is also unknown terrain.
About 90% of all life lives in the undiscovered parts of the ocean.
So we still have lots to look for (unless you're hydrophobic
)
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We've been to the bottom, we covered a few square miles of it. Are you telling me the 99,99999999% of the bottem that we didn't go to is exactly the same?
Its like saying you've explored Africa when you stood on the rock of Gibraltar and gazed in a southwards direction xD