Perilous Times
From The Times
May 24, 2010
Oil spill brings ‘death in the ocean from top to bottom’
Frank Pope
It has been an hour since our sport-fishing boat started streaking
through the freshly oil-soaked marshes of Pass a Loutre, but we’re
still only halfway through the slick. Eighteen miles out and the stink
of oil is everywhere. Rashes of red-brown sludge are smeared across
vast swaths, between them a swell rendered faintly psychedelic with
rainbow-coloured swirls.
Cutting the engines, we slide to a stop near Rig 313. We’re not
supposed to be in the restricted zone, but other than the
dispersant-spraying aircraft passing overhead there’s no one to see us.
Despite the thick oil, we’ve seen only two clean-up boats out of the
1,150 that the response claims to have on site: one was broken down,
the other was towing it.
Skimming and burning are the most visible elements of the clean-up
operation, and that’s no accident. Over the past few days it’s become
clear that far more oil is gushing from the seabed than BP had
admitted. Oil has been prevented from reaching the surface by
dispersants injected into the flow some 5,000ft below, but is spreading
through the midwater in vast, dilute plumes.
Along with the marine toxicologist Susan Shaw, of the Marine
Environmental Research Institute, I’ve come to peer into the hidden
side of the Deepwater Horizon disaster. Wreathed in neoprene and with
Vaseline coating the exposed skin around our faces, we slip into the
clear water in the lee of the boat. Beneath the mats of
radioactive-looking, excrement-coloured sludge are smaller gobs of
congealed oil. Taking a cautious, shallow breath through my snorkel I
head downwards. Twelve metres under, the specks of sludge are smaller,
but they are still everywhere.
Among the specks are those of a different hue. These are wisps of
drifting plankton, the eggs and larvae of fish and the microscopic
plants and animals that form the base of almost all marine food webs.
Any plankton-eating fish would now have trouble distinguishing food
from poison, let alone the larger filter-feeders.
Onshore, small landfalls of the same sludge have started to cause panic
among locals as they coat the marshes. Here, just a few feet beneath
the surface, a much bigger disaster is unfolding in slow motion.
“This is terrible, just terrible,” says Dr Shaw, back on the boat. “The
situation in the water column is horrible all the way down. Combined
with the dispersants, the toxic effects of the oil will be far worse
for sea life. It’s death in the ocean from the top to the bottom.”
Dispersants can contain particular evils. Corexit 9527 — used
extensively by BP despite it being toxic enough to be banned in British
waters — contains 2-butoxyethanol, a compound that ruptures red blood
cells in whatever eats it. Its replacement, COREXIT 9500, contains
petroleum solvents and other components that can damage membranes, and
cause chemical pneumonia if aspirated into the lungs following
ingestion.
But what worries Dr Shaw most is the long-term potential for toxic
chemicals to build up in the food chain. “There are hundreds of organic
compounds in oil, including toxic solvents and PAHs (polycyclic
aromatic hydrocarbons), that can cause cancer in animals and people. In
this respect light, sweet crude is more toxic than the heavy stuff.
It’s not only the acute effects, the loss of whole niches in the food
web, it’s also the problems we will see with future generations,
especially in top predators.”
When a gap in the slick opens, I dive on one of the huge steel legs of
the rig. Swirling around it are dozens of some of the biggest fish I’ve
seen in nearly 20 years of diving. Huge cobia, amberjack, mangrove
snapper and barracuda thrive on the shelter provided by the rig
structures, creating some of the most sought-after game fishing in the
United States: our skipper claimed that he’d hosted three world
record-breaking catches last year.
“They’ll be healthy enough now, but it’s just a matter of time,” Dr
Henry Bart, a fish biologist at Louisiana’s Tulane University, told me
later. “Cobia feed on upper water-column species. The oil is going to
magnify up through the food chain.”
What happens to marine species in the dark, unseen waters below us is
less certain. In the Gulf the depths are better known than almost
anywhere in the world, for the oil industry has to show what exists on
the seabed before any drilling can begin. This, along with an on-going
Census of Marine Life, has helped to reveal that life within seabed
sediments is astoundingly varied.
A pod of sperm whales resides off New Orleans and is believed to be
dining on giant squid. These ultimately depend on the tiny specks of
life that are slowly being poisoned at the surface.
What happens next, no one can say for sure.