Inaccurate surveys of ocean depths a threat to mega-ships

Inaccurate surveys of ocean depths a threat to mega-ships

When the 3,351-TEU container ship Rena grounded off New Zealand in 2011, the cargo losses totaled $1 billion, and the salvage operation took seven months.

The loss pales in comparison to what’s at stake as the latest generation of container ships approach 20,000 20-foot-equivalent units. “The Rena, next to an ultra-large container ship, would be like an average-sized 2-year-old next to Shaquille O’Neal,” Chris Smith, senior vice president of ocean marine at Endurance Insurance, said at an American Institute of Marine Underwriters seminar last May. “Pick a figure: $2 billion, $3 billion, $4 billion. A grounding by an ultra-large container ship with a large capacity cannot be ruled out, and the loss could be $4 billion.”

And, while it took seven months to clean up the Rena, it “could take two years to remove all the containers from a 19,000-TEU ship in the event of an incident, assuming that it was possible at all,” Allianz Global Corporate & Specialty Insurance wrote in its Safety and Shipping Review 2015, released in January.

The risk of such a catastrophic loss only increases as more mega-vessels begin calling at ports around the world that have never seen ships of that length, width and depth. More alarming, according to a new report from the Global Marine Practice at insurance brokerage Marsh, is that accurate surveys of ocean depths — or bathymetrics, the underwater equivalent of topography — are inadequate or nonexistent in large expanses of the world, with many areas either having no survey or having surveys that haven’t been verified since being done more than a century ago.

In the U.S., at least, bathymetric surveys have been performed to modern standards on 75 percent of navigationally significant waters, according to Royal Navy Rear Adm. Tim Lowe, the U.K.’s national hydrographer. That’s superior to many other developed and undeveloped countries, including the U.K. itself, which has adequate surveys on less than half of its coastal waters. Other shipping giants fare even worse, including Japan, 46 percent; Australia, 35 percent; Panama and the Philippines, 25 percent each, according to the International Hydrographic Organization, the intergovernmental institution that coordinates the world’s coverage of official nautical charts.

Navigation routes to the Panama Canal, for example, have been the same for years, with cargo vessels following “tried-and-tested pathways,” the Marsh report found. But what’s safe for a vessel requiring 40 feet of draft may not be safe for one requiring nearly 55 feet, as today’s largest container ships do, and that’s where the risk multiplies.

“We have better maps of the surface of Mars and the moon than we do the bottom of the ocean,” the Marsh report quoted Gene Feldman, a U.S. oceanographer for NASA, as saying. “We know very little about most of the ocean.”

If progress is to be made, it may have to come from the International Maritime Organization and its Safety of Life at Sea convention. As with the SOLAS weight verification mandate currently roiling container shipping markets, the IMO, in this case since January, has the power to audit the performance of countries in their obligation to provide safe passageways for vessels. In a strange twist, however, the IMO has no power to force countries to fulfill that obligation, nor do vessel operators have to share the bathymetric data their vessels collect, according to the Marsh report.

Lacking that accurate data, it may not be a matter of if a catastrophic event will occur with an ultra-large container ship, but when. And when it does, the industry best prepare for new regulations that lead to disruption the likes of which make all others look like a day at the beach.  

Contact Chris Brooks at and follow him on Twitter: @cbrooks_joc.




This is an excellent paper on the subject of the adequacy of Hydrographic Surveys that has recently been published by insurer Marsh Marine UK . Marsh should be congratulated on raising such an important issue for the safety of navigation in their report. It is a subject long overdue for open and wider discussion. These days we seem to focus on the introduction of modern technology, such as ECDIS and ignore the basic data necessary for this electronic equipment to function safely. Over the past 12 months ports around the world , in addition to very deep draught V/ULCC tankers and Valemax bulkers, have heralded the arrival of ever-larger, record-breaking container ships. With the increase in size comes greater risk. Commercial vessels of enormous proportions – in terms of length, width, and depth – are already, or will soon be, plying waters around the world that have never before witnessed such vessels, or so many of them. This is at a time when the IHO advises that, accurate bathymetric data is inadequate or non-existent in large tracts of the world’s oceans and seas, with large areas either unsurveyed or not re-checked since old lead-line soundings, measured in fathoms, were taken nearly a century ago, when vessels literally “plumbed the depths.” They are pleading with governments to invest more in funding for hydrographic surveys not only in their own waters but also International waters. It is imperative that those governments and ports that are keen to herald the arrival of newer, larger vessels provide accurate bathymetric data to modern standards, to ensure safe and navigable waterways for modern vessels to use. Owners and Operators of these vessels must also ensure that their crews are aware of these concerns. Don't just trust the ECDIS as the hydrographic data displayed may be 150 years old! The full Marsh report can be accessed at Captain Chris Allport FNI

Perhaps ignorance on my part but, were I insuring a vessel with a cargo worth several hundred million rather than only 10-20m, I might insist it took routes only if they have been surveyed to modern standards.