150,000 square feet of barnacles and sea gunk: The latest problem in the Strait of Hormuz

Barnacle Plague in the Strait of Hormuz: A Growing Challenge for Global Oil Supplies

150 000 square feet of barnacles – The Persian Gulf has become an unexpected battleground for marine life, as hundreds of massive oil tankers have been stranded for weeks. This stagnation has led to a significant buildup of barnacles, algae, and other biofouling organisms, creating a logistical nightmare for maritime operations. The accumulation of these natural deposits has added a new layer of complexity to the already strained energy supply chain, exacerbated by months of conflict that disrupted global oil flows.

For Derek Hamm of Obsessive Compulsive Divers in Marathon, Florida, the situation is both familiar and frustrating. “Four months?” he remarked. “Man, that’s plenty of time for a lot of gross stuff to accumulate.” The marine growth, which includes mussels, clams, and various algae species, has covered the hulls of anchored vessels, turning them into biological fortresses. To restore their functionality, crews of scuba divers must tackle the task of “bottom cleaning,” a job that involves manually removing these organisms from the ships’ undersides.

The Cost of Cleaning a Floating Fortress

The scale of the operation is staggering. Oil supertankers, which are more than 1,000 feet long and have a beam of around 150 feet, offer 150,000 square feet of surface area to be scrubbed. For each vessel, a team of five to six divers typically spends four to five hours scraping biofouling using hand tools and high-pressure equipment. With over 600 ships awaiting clearance, this work has become a massive undertaking, demanding both physical endurance and specialized skills.

Brian McCauley, owner of McCauley Mooring and Diving, noted that the task, while straightforward, is made challenging by the sheer size of the vessels. “The work is straightforward and not complicated, but those ships are just way too big for individual divers,” he explained. Bottom cleaners rely on lances, sanders, and pressure washers, all powered by onboard generators, to remove stubborn deposits like barnacles. However, precision is key, as damaging the ship’s protective coatings can trigger ecological violations and costly insurance claims.

Aron Sørensen, chief environment officer at BIMCO, reported that the sudden demand for cleaning services has driven up prices. “The instant demand surge has allowed bottom cleaning teams to increase their fees by a few thousand dollars,” he said. Rates now exceed five figures per ship, reflecting the urgency of the task. This financial burden underscores the critical role biofouling plays in the global energy sector.

Why Biofouling Matters: More Than Just a Mess

While the sight of barnacle-covered ships might seem trivial, the consequences are far-reaching. Neil Roberts, head of marine and aviation at Lloyd’s Market Association, emphasized that biofouling disrupts fluid dynamics, making vessels significantly less fuel-efficient. “Fuel accounts for about 50% of a ship’s operating costs,” he said. The added weight of marine growth increases fuel consumption, raising expenses for operators who transport oil across thousands of miles from the Middle East to Asia or Australia.

Propellers are particularly vulnerable to biofouling. Carolyn Shearlock, owner of The Boat Galley, explained that severe growth on rotors can render them ineffective over time. “This is more common in boats that have been anchored for several years,” she added, noting that the problem is now acute due to the prolonged stasis of tankers in the strait. Even minor buildup can cause drag, requiring divers to invest significant effort in cleaning these components.

Moreover, the presence of biofouling poses ecological risks. Divers must ensure that invasive species, which can hitch a ride on the hulls, are removed before ships reach port. These organisms, trapped between layers of marine growth, can wreak havoc on local ecosystems. Maritime regulations now mandate that vessels undergo this cleaning process to maintain environmental standards and ensure efficient operations.

Historically, biofouling has been a persistent issue. As far back as centuries ago, warships were equipped with copper bottoms to deter wood-boring worms. This practice highlights the longstanding battle between human ingenuity and marine life. “It’s an age-old problem,” Roberts remarked, underscoring the irony that modern energy infrastructure faces similar challenges despite technological advancements.

The situation in the Strait of Hormuz has also taken a geopolitical turn. Iran recently announced that all companies operating in the region must register with the country to facilitate the clearing of biofouling. This requirement adds another layer of complexity, as it ties the logistical challenge to regulatory oversight. Minesweepers, tasked with navigating the narrow waters, now face the dual challenge of ensuring safe passage and maintaining the cleanliness of anchored vessels.

Implications for the Global Energy Economy

The financial impact of biofouling extends beyond individual ship operators. For the global energy market, the cost of inefficient fuel use could ripple through supply chains, affecting prices in downstream industries. “Severe growth on propellers can render them completely useless over time,” Shearlock warned, highlighting the potential for operational delays if cleaning is not prioritized.

Marine life also infiltrates intake valves, disrupting cooling systems and further complicating maintenance efforts. Hamm pointed out that these hidden intrusions can be just as damaging as visible barnacle colonies. The combination of these issues means that even a single tanker’s downtime can have cascading effects on oil distribution, particularly as demand for energy remains high.

As the world grapples with energy supply shocks, the problem of biofouling in the Strait of Hormuz serves as a reminder that nature’s resilience can create unexpected obstacles. The process of cleaning these ships, though labor-intensive, is essential to maintaining the efficiency of one of the globe’s most vital shipping routes. For the crews performing this work, it’s a high-stakes job that demands both skill and perseverance in the face of an ever-growing biological threat.

In the end, the effort to combat biofouling is just one step in the broader process of getting oil back on its path. With the strait remaining a focal point of geopolitical tensions, the challenge of keeping ships clean has become as critical as ensuring their safe navigation. As the industry adapts to these new conditions, the role of bottom cleaners continues to evolve, proving that even in the modern era, the fight against marine life is as enduring as it is essential.