Known as the ‘Door to Hell,’ this ... into a massive pit of natural gas. In an attempt to prevent a dangerous gas leak, scientists set it on fire, thinking it would burn out in a few weeks.

"What to do when the Door to Hell collapses to escape the flames. How to Survive is a Webby Award-winning series offering expert tips for surviving disasters, attacks, and life's toughest situations.

The lawsuits are the first coordinated effort by plaintiffs to extract damages for the claimed health effects from the burn pits. The military has acknowledged the concerns but said its own test ...