The last redivision of the world
By WILLIAM J.
BROAD
Tom Dettweiler makes his living miles down. He helped
find the Titanic. After that, his teams located a lost submarine heavy with
gold. In all, he has cast light on dozens of vanished ships.
Mr. Dettweiler has now turned from recovering lost
treasures to prospecting for natural ones that litter the seabed: craggy
deposits rich in gold and silver, copper and cobalt, lead and zinc. A new
understanding of marine geology has led to the discovery of hundreds of these
unexpected ore bodies, known as massive sulfides because of their sulfurous
nature.
These finds are fueling a gold rush as nations,
companies and entrepreneurs race to stake claims to the sulfide-rich areas,
which dot the volcanic springs of the frigid seabed. The prospectors —
motivated by dwindling resources on land as well as record prices for gold and
other metals — are busy hauling up samples and assessing deposits valued at
trillions of dollars.
“We’ve had extreme success,” Mr. Dettweiler said in a
recent interview about the deepwater efforts of his company, Odyssey Marine
Exploration of Tampa, Fla.
Skeptics once likened mining the deep to looking for
riches on the moon. No more. Progress in marine geology, predictions of metal
shortages in the decades ahead and improving access to the abyss are combining
to make it real.
Environmentalists have expressed growing alarm, saying
too little research has been done on the risks of seabed mining. The industry
has responded with studies, reassurance and upbeat conferences.
The technological advances center on new robots,
sensors and other equipment, some of it derived from the offshore oil and gas industry. Ships
lower exploratory gear on long tethers and send down sharp drills that gnaw
into the rocky seabed. All of this underwater machinery is making it more and
more feasible to find, map and recover seabed riches.