Those morons at New7Wonders didn't include it. So what did they include?
Guam's Blue Hole!
What kind of crap is that? There aren't even any fish at the Blue Hole because Guam has been completely fished out.
From the Vote for the Blue Hole page on New7Wonders.com:
Blue Hole300 feet? 300 feet!
Guam is the southernmost island in the Mariana island chain and the largest island in Micronesia. Guam's Blue Hole is a natural limestone vertical shaft formed millions of years ago which extends down into the reef. The opening is approximately 35 x 25 feet. The upper reef varies in depth from 20 feet near the cliffline, to 55-60 ft at the upper opening of the shaft. From there, it drops downward to 300+ feet.
The Marianas Trench dips down 7 miles?! What the heck!?
Vote for Guam's Blue Hole here: