[thackney]

if that wouldnt have happened gravity would crush him to a pretty small size

Nope, in the center gravity forces would be zero. You would have equal pull in all directions so you would be weightless.

[aft_lizard]

But getting there is a different story.

[Mr J]

Yes, suspended at the gravitational center of the earth, IMO.

[Robert A Cook PE]

But remember the difference between "gravity" ( a force caused the difference in mass above you and below you) and "pressure" the squishing sense of being extruded into rocky crystals like diamonds by a force of 100,000 of tons per sq millimeter by all of the (very heavy) rocks above you.

So, yes, if you could get a protected hollow sphere into the exact center of gravity of the middle of the earth you might be weightless (except for the moon's and sun's pull) but you might have a problem opening the door of your sphere to get out ...