An investor group is planning for a doomsday scenario by building a $300 million luxury community replete with underground homes. There will also be air-lock blast doors designed for people worried about a dirty bomb or other disaster and off-grid energy and water production.

Residents will enjoy an equestrian center, 18-hole golf course, polo fields, zip lines and gun ranges. Retail shops, restaurants and a row of helipads are also in the works. For those looking to "get away," they'll also be able to enjoy three white sand beaches and a neighborhood spa.

"We've evolved it into long-term sustainability instead of a survival community," Trident Lakes CEO Jim O'Connor told the Houston Chronicle, adding that the 400 planned condos will house about 1,600 people. "The concept is to build a community that will last two centuries or longer. That means we're looking at designs that include earth structures that won't be exposed to the elements."

Residents will first be able to move-in possibly as soon as 2018, O'Connor said, with construction slated to potentially begin next year.