Scientists work to protect the World War II shipwrecks of Truk Lagoon and prevent them from releasing contaminants into the water.

The shallower Truk Lagoon wrecks, and those in areas of higher current, are deteriorating more rapidly.

The wrecks of Micronesia’s Truk Lagoon have withstood the corrosive effects of seawater for nearly 75 years — but how much more can they take?