Here are ten interesting ways steel is used at sea.

Early Ships

In 1940, the construction of the world’s first all-welded ship, the SS Exchequer, was completed in Mississippi, US. The steel plates of the cargo vessel’s hull were welded end-to-end rather than overlapped and riveted—a technique that revolutionized shipbuilding at the time.

Since then, ships have been made almost exclusively of welded steel, thanks to the material’s affordability and lightweight properties.

Flood Protection

Steel plays a crucial role in protecting our lands from floods. Its durability and sheer strength make it an ideal underwater barrier to protect cities that are at high risk of flooding.

The Thames Barrier, for example, fortifies central London from floods caused by tidal surges. Weighing in at 3,700 tons, the barrier is made up of 10 steel gates and stretches 520 meters across the Thames River, the UK’s most famous waterway.

Artificial Reefs

Hurricane-resistant steel has been used to create hundreds of wave-resistant barriers that surround the shorelines of the Caribbean, American Gulf Coast and Southeast Asia.

Some of these steel reefs have been designed to force waves to break offshore and deposit their energy in a different area than directly on the coastline, thus protecting beaches. Others hold in sediment on beaches to prevent coastal erosion, while still others promote water activities like surfing.

Marine Life Preservation

What do you get when you toss some 25,000 decommissioned New York subway cars into the ocean? A marine life habitat, of course.

Primarily consisting of steel, the Redbird Reef off the eastern coast of the United States has functioned as a source of sanctuary and food for marine life, offering more viable conditions for the growth of nutrients and organisms than the sand bottom.

Meanwhile, other materials like steel slag have been used to promote marine forestation in damaged marine ecosystems.

Powering Renewable Energy

Steel is an essential material used in the development of tidal energy solutions worldwide, from the poles which secure turbines to the ground to their rotating blades. Considering the fact that tidal energy could eventually satisfy more than 20 percent of global energy demand, steel plays a key role in unlocking the renewable energy capacity of our oceans.

Similarly, steel makes up around 80 percent of all materials used to construct wind turbines that emit minimal carbon dioxide when producing energy.

Megaships

When it comes to building the world’s biggest megaships, there’s no material as favored by engineers than steel.

Take the Royal Caribbean International’s Harmony of the Seas cruise ship, for example. It was constructed with 227,000 tons of steel—enough material to build 31 Eiffel Towers. Standing upright, it is 210 feet tall, more than three times the height of London’s Olympic Stadium, and is nearly as long as four soccer fields combined.

Undersea Tunnels

Noting the comparable advantages undersea tunnels have over bridges, like their ability to divert traffic and not be affected by external factors, city planners began incorporating them into city layouts in the late 1800s.

The first notion of the Channel Tunnel, which connects England and France, was proposed in 1802, but didn’t become a reality until the 1960s. With 400 trains carrying 50,000 passengers and 54,000 tons of freight passing through it every day, steel reinforces other materials to keep the tunnel strong and sturdy.

Shipping

Ninety percent of global cargo is carried by sea. Because the size of steel ships and containers allows for enormous loads to be transported in a single trip, the majority of the 17 million shipping containers currently in use are made from steel.

Included among these shipping giants are Maersk’s Triple-E, the largest cargo ship in the world. It can fit approximately 18,000 shipping containers—enough space for 36,000 cars or 108 million pairs of sneakers!

Submarines

While submarine designs and oceanic capabilities have advanced over the centuries, one thing has remained constant—their steel construction.

Steel has the ability to withstand corrosion and avoid oxidizing reactions such as rust. It is also lightweight enough that it can be fast and effective in maneuvering underwater. As a result, the submarine’s steel body has enabled it to accomplish extraordinary expeditions, including James Cameron’s DEEPSEA CHALLENGER’s voyage to the deepest known part of the Earth.

Connecting the World

Steel is essential in the construction of canals. It is used to form the structure which supports the entire operation and is also utilized to make the locks so that they are tough enough to withstand extreme forces like water pressure.

The Panama Canal, for instance, is the largest canal in the world, with around 14,000 ships passing through it annually. Thanks to a system of large steel locks, the canal connects the Atlantic and Pacific oceans.

This article is based on the #lovesteel materials published by the World Steel Association.

Submarines: The Ocean’s Steel Whales

Steel Solutions in Wind Power

Steel Wonders of the World: The Panama Canal

Water World: The Past, Present and Future of Undersea Tunnels

Making Waves in Ocean Conservation

Recycled Steel Changing the Way the World Uses Metal

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Since the publication of Jules Verne’s 20,000 Leagues Under the Sea in 1869 up until the dawn of today’s sci-fi thrillers such as Stargate Atlantis, the concept of underwater exploration and civilization has captured the imagination of the public. Now, facing problems like overpopulation, rising sea levels and increasing natural disasters, humanity is seeking alternative living environments, and with ever-progressing technology, life under the sea no longer seems all that unrealistic.

In fact, some small underwater habitats already exist, and we have the technology to create and maintain larger ones that could easily support human sustenance. Might it be possible that one day there will be an entire network of undersea cities, brimming with futuristic technology and advanced ways of living? And if it is, how would these sub-aquatic societies be connected? 

Undersea Tunnels, a Brief History

Undersea tunnels, the most likely method of transportation in a world submerged by water, are not a new concept. In fact, the earliest example of such engineering endeavors dates back to around 2100 BCE, when the Babylonians used a tunnel to divert the Euphrates River. It wasn’t until the 19^th century that the world saw a succession of more challenging tunnel projects, made possible by vast improvements in surveying and ventilation techniques.

The first notion of the Channel Tunnel, which connects England and France, was proposed to Napoleon Bonaparte in 1802 by a French engineer named Mathieu-Favier, but it wasn’t until the 1960s that it became a reality. Instead, London’s Thames Tunnel became the first modern undersea tunnel in 1843, taking almost 20 years to complete. The tunnel was originally designed for, but never used by, horse-drawn carriages.

Noting the comparable advantages undersea tunnels have over bridges, such as their ability to divert traffic and not be affected by external factors such as wind or rain, city planners began incorporating them into city layouts in the late 1800s. But, at the time, the methods used to construct these tunnels consisted mainly of excavating in painstakingly small increments, and were incredibly time consuming.

The game changed in 1903 with a construction project beneath the Detroit River in America when engineers used a method that involved anchoring premade sections of steel tube into a pre-dug trench on the river floor. Then, in 1971, a new era of underwater tunneling began with the construction of the Seikan Railroad Tunnel, which currently stretches 53.85 kilometers beneath the Tsugaru Strait in Japan. Instead of using the antiquated tunneling techniques of the past, tunnel builders began to utilize giant tunnel boring machines to make the process go faster. Since then, tunneling projects that could once only be conceptualized have become a reality.

The Eurasia Tunnel Project, for example, is a 14.6 kilometer-long road tunnel that will link Europe and Asia via the Bosporus Strait, and is currently in the last stages of construction. It is a project that has long been discussed and aims to reduce traffic in Istanbul, the second-worst European city in terms of traffic congestion.

Tunneling to the Future

Of course transportation tunnels like these would be vital in aquatic lands, but a sustainable undersea city would also need gas, oil, electricity and, most importantly, oxygen. Yet, some of these types of undersea tunnels exist, and are constantly being positioned across the waters of the world.

In the most recent tunnel developments, POSCO, in coordination with GS Caltex and Jeonnam Development Coorporation, has made plans to construct a 3.98 kilometer-long undersea tunnel connecting Gwangyang Port and Yeosu Industrial Complex by the first half of 2019.

POSCO Green Gas Technology will use the undersea pipe network to supply syngas produced at the Gwangyang SNG Plant to GS Caltex, which will then use the syngas for petroleum refining and enhancing processes. Furthermore, the undersea tunnel will minimize risks associated with transport and establish an efficient undersea logistics infrastructure by reducing production and logistical costs.

POSCO’s gas pipeline tunnel is indicative of what is to come. Perhaps the undersea tunnels of the future will allow for the transportation of fresh drinking water, alternative energy resources or even food sources from faraway lands. But with real-life projects concerning tunnels between Morocco and Spain, Japan and South Korea and the mainland of Canada and Prince Edward Island on the table, it is clear that such possibilities are not only realistic, but also limitless.

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