There are great journeys in the ocean, aren't there, child?

This rock in the middle of the sea is telling that the sea is not deep at all, it becomes higher somewhere, it becomes much deeper, sometimes it is deep for several kilometers, this is the characteristic of the sea, the sea is very wide, 70 percent of the world. On it, the ocean is the ocean and only land is 30 percent. The ocean is huge. Millions of creatures live in it.