Answer:
The gravitational force would be about the same.
Explanation:
The gravity changes according to the elevation, if you get high enough, you will start to get farther from the gravitational pull created by earth, and for you, it will be weaker. However, if you get deeper into the ocean, it would be the same as being standing on the sea surface level, or at the beach.
The amount of mass being above or beneath you does not affect the gravitational pull enough to be noticeable or even measurable.