I hope you have a valid visa. The Immigration authorities may be waiting for you as you pop out of the hole.
I hate to burst your bubble, but
It’s the center of the Earth-Moon system that orbits the Sun. So at the center of the Earth you would feel some small tidal forces from the Sun and Moon, but pretty negligable.
I’d be more interested in your disproving (or proving???) the Hollow Earth theories that are still around.
No, no, no - then you would end up in Pebble Beach, is that where you are going?
Damn these interruptions!
I’ll tell you tomorrow, when I finally break through to Perth. I’ve been making good progress, I’ve dug a good hole a 18" deep, using a snow shovel. But some asshole keeps filling in the hole with empty Fosters cans.
I need a little break.
pop
fizz
gulp
passes out on ground, due to increased gravity
And the Carrot Festival, therein?
No, no, no. It’s Pismo beach!
Just in case you veer a bit off course, I’ve popped a six pack of beers in the fridge for you too!
So what you’re all saying is, we should hang an…uh… down at Albuquerque?
Ah, watch out for that gravity storm!
[sub]Don’t look at me, someone else started the Looney Tunes references![/sub]
If you did end up in the middle of the Indian ocean, would the water flood back down your hole and burst out in America?
And if you did end up in Perth, give it ten minutes and you’d wish the heat & pressure HAD killed you 
mm
Come, come, my dear fellow. We don’t want to scare poor tdn away.
Now then, tdn, I’d like to extend the hand of welcome to our fine country. We are a very easy-going people with a laid-back attitude, and no meddling laws or litigation like in the USA.
Just a couple of things though…
I see you’re planning on creating a hole. Do you have planning permission from the local municipal council? Have you checked if the land is zoned residential, light industrial, or “Hole”? Have you arranged public liability insurance? I assume you have conducted an Environmental Impact Study (EIS)? Have you contacted the Australian Taxation Office? Customs and Quarantine? Department of Immigration? Are there heritage concerns? You’ll to call Telstra to ascertain the location of any tepephone cables in the area you wish to excavate. There will be a fee for this, of course. An answer will be given within twenty-eight days. Ditto electicity utilities. Ditto water authority. Ditto sewage. Is there an Aboriginal land claim on the area? Workers you employ will require compulsory superannuation. You willl need to enter into an Australian Workplace Agreement with them.
Welcome. 
Okay, so you’ve got a tube protecting you from the side pressures. Wouldn’t atmospheric pressure start to get a little oppressive?
Come to think of it, what would the atmospheric pressure be in the middle of the tunnel dug straight through the earth?
Not in my magic tube. But in someone else’s? Yeah, good question. One would think that the air would get a little – THICK.
Unless the wall around the tube was very well heat-insulated, the Indian Ocean water would be superheated steam, i.e., a very spectacular geyser.