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Demolition projects and those who pull them off, including the Loizeaux family, the experts responsible for imploding Pittsburgh's Three Rivers Stadium and Seattle's Kingdome.

Concertgoers are killed when a stage collapse at the Indiana State Fair; a possible gas leak levels two buildings and kills eight people in New York City; a train crossing is the site of two disastrous auto collisions in one year.

An explosion in a San Bruno, Calif. neighborhood demolishes homes and kills residents; A captain and crew sail their ship into the course of Hurricane Sandy; A building full of garment workers abruptly collapses and traps many of them inside.

A jetliner crashes with 228 people on board; An oil refinery explodes in Utah, damaging over 100 homes; Manhole covers explode around the country; A coal filled freight train derails; a routine elevator ride becomes deadly.

A massive explosion shakes a small Texas town killing 15 people; a bridge in Washington collapses sending cars down into the river; a building demolition in Philadelphia goes terribly wrong.

A 72 oil-car runaway train crashed, killing 47 people and leveling half a town; a huge sinkhole at the National Corvette Museum; 33 Chilean miners are trapped almost a half mile underground.

Asiana flight 214, packed with passengers, suddenly crash lands; a huge explosion at a chemical plant outside Wichita, Kan.; dangerous sinkholes exist in 20 percent of the United States.

Legend has it that 500 years ago, a vast fortune in gold was hidden by the Aztecs somewhere in the American southwest; now, three families are closing in on what they believe is the location of the treasure.

The Dillman family completes the underwater dye test at Shadow Cave; in Nevada, the miners bring in a Cave ROV; the Villescas family makes a new discovery that could be an important clue from an old treasure hunter.

The Dillman family breaks out the excavator to dig up the mysterious marsh, which may have previously revealed an ancient artifact.

The Dillman family seeks answers in the mysterious Weeping Cave; the Villescas family builds a shaker box to help sift through material at a faster pace; in Nevada, the miners bring an expert to look at a very unusual discovery from the mine.

The Villescas family talks with an expert about whether or not a spur is related to the Conquistadors; the Dillmans use drones to locate an important ancient symbol that could be a map.

In New Mexico, the Villescas family decides to bring in more heavy machinery and a full crew to find conquistador gold; in Nevada, the miners' years of Aztec research is threatened.

In Utah, the Dillman family drills into what they believe could be the hidden treasure chamber that their grandfather predicted; after a close encounter, the gold miners in Nevada must find another way into the rest of the underground tunnel system.

In Utah, the Dillmans must be careful not to trigger an Aztec water trap while digging deep into the cave chamber; in New Mexico, after finding a man-made vault, the Villescas family discovers that there are more secrets buried beneath the fire pits.

Legend has it that 500 years ago, a vast fortune in gold was hidden by the Aztecs somewhere in the American southwest; now, three families are closing in on what they believe is the location of the treasure.

The Dillman family completes the underwater dye test at Shadow Cave; in Nevada, the miners bring in a Cave ROV; the Villescas family makes a new discovery that could be an important clue from an old treasure hunter.

The Dillman family breaks out the excavator to dig up the mysterious marsh, which may have previously revealed an ancient artifact.

The Dillman family seeks answers in the mysterious Weeping Cave; the Villescas family builds a shaker box to help sift through material at a faster pace; in Nevada, the miners bring an expert to look at a very unusual discovery from the mine.

The Villescas family talks with an expert about whether or not a spur is related to the Conquistadors; the Dillmans use drones to locate an important ancient symbol that could be a map.

In New Mexico, the Villescas family decides to bring in more heavy machinery and a full crew to find conquistador gold; in Nevada, the miners' years of Aztec research is threatened.

In Utah, the Dillman family drills into what they believe could be the hidden treasure chamber that their grandfather predicted; after a close encounter, the gold miners in Nevada must find another way into the rest of the underground tunnel system.

In Utah, the Dillmans must be careful not to trigger an Aztec water trap while digging deep into the cave chamber; in New Mexico, after finding a man-made vault, the Villescas family discovers that there are more secrets buried beneath the fire pits.

Legend has it that 500 years ago, a vast fortune in gold was hidden by the Aztecs somewhere in the American southwest; now, three families are closing in on what they believe is the location of the treasure.