Underwater 3D Printing of Concrete Ready for DARPA Assessment
agents,” Nair said. “When it extrudes, even if you don’t have washout, you still want it to be able to hold the shape and bond well with the other layers. There are multiple parameters at play.”DARPA added one more hurdle: The concrete needed to consist primarily of seafloor sediment and only include a small amount of cement. Incorporating material from the bottom of the ocean would minimize the logistical difficulty of transporting large quantities of cement by ship.In September, the Cornell team successfully demonstrated to a group of visiting DARPA officials that they
Saab’s Seaeye Lynx Surveya San José Shipwreck
Lynx was used in multiple deep-sea survey missions. These missions captured high-resolution imagery and three-dimensional photogrammetry of the wreck at approximately 600 meters depth. They also included recovering and documenting artifacts such as a cannon, three gold coins, Chinese porcelain cups and sediment samples for further analysis and laboratory studies to support their research and protection.Seaeye Lynx is used internationally for subsea survey and inspection tasks. Its role at the San José site forms part of a wider effort by Colombian authorities to document and preserve underwater
New Study Reveals How Greenland’s Seaweed Stores Carbon in the Deep Ocean
case study area as it provides an ideal location to test the assumptions underlying estimates of macroalgal export from coastal areas to the deep sea. The area has abundant macroalgae on its rocky coastline, the dominant species of brown algae float when detached, and other studies have confirmed that sediment eDNA identified macroalgae in sediment extending from shallow nearshore areas to 1460m depth and 350 km offshore. The prevalence of macroalgae in Greenland and Arctic shelf, slope and deep-sea sediments, with a dominance of brown algae, has been maintained for millennia, documenting that macroalgae
USACE's Major General Jason Kelly & Modernizing America’s Waterways
materials promise longer life cycles and reduced maintenance—critical advantages when assets are 70-plus years old.Asset Management Tools: Sophisticated analytics provide deeper insights into structural health, helping the Corps prioritize resources with greater accuracy.Optimized Dredging & Sediment ManagementOn the coastal side, Kelly stresses the need for sustainable navigation and channel deepening to accommodate today’s larger vessels. “If we are going to remain competitive globally, we must advance deep-draft projects,” he says.The New Reality: Faster, Leaner, More Integrated
Profiling Survey of the Columbia River Project Site Completed
Marine environmental consulting firm CSA Ocean Sciences Inc. (CSA) has completed a sediment profile imaging (SPI)/plan view (PV) survey of an 85-mile stretch of the Columbia River.The survey, conducted between The Dalles, Oregon to Vancouver, Washington, supports planning for the Cascade Renewable Transmission (CRT) Project, a proposed underwater and underground transmission line capable of transferring approximately 1,100 MW of energy beneath the Columbia River to the Portland area.This environmental baseline survey, awarded to CSA by HDR on behalf of the CRT Project, utilized CSA’s exclusive
Ocean Geophysics, HighTide Team Up for Offshore Data Processing
and pipeline installation, and oil and gas projects.Seabed data processing plays a critical role in offshore wind development, informing site selection, foundation design, array layout and safety assessments. Wind turbines and export cables rely on detailed understanding of seabed conditions, including sediment movement, shallow geology and geohazards.Under the agreement, the two companies will offer integrated data processing for multibeam echosounder surveys, backscatter, GIS and charting data, as well as seabed mobility studies, boulder mapping and foundation risk assessments.The joint offering also
A Project Called Azorian: Doing the Impossible
propellers driven thrusters on the capture vehicle were used to position it over the wreckage of the submarine. The large hydraulic cylinders at each corner of the capture vehicle would support it on the seabed while the davits were driven under the submarine using water jets to help them penetrate the sediment. Once the davits cradled the submarine, the cylinders would be extended, pull the submarine out of the sticky sediment and left behind as the submarine was lifted off the seabed.The collector vehicle was assembled out of sight in a huge specially built barge so no one would get even a glimpse of
Global Efforts Underway to Document Plastic Pollution
ocean is being tackled by nuclear scientists globally as part of the NUclear TEChnology for Controlling Plastic Pollution (NUTEC Plastics), an IAEA initiative launched in 2020. Using nuclear-derived imaging techniques, scientists can identify even the tiniest plastic particles in seawater, beach sand, sediment and in marine organisms.NUTEC Plastics equips laboratories worldwide with the technology and technical knowledge required to sample, analyze, and monitor microplastic pollution in the ocean.For example, IAEA experts from the Environment Laboratories in Monaco have undertaken sampling missions to
Antarctic Mountains Could Boost Ocean Carbon Absorption
surrounds the continent, potentially enhancing its ability to absorb atmospheric carbon dioxide, according to the research published in Nature Communications.A team of scientists with expertise in oceanography, ice sheet modelling and geochemistry contributed to the study which looked at analysis of sediment samples from East Antarctica's Sør Rondane Mountains. They discovered that weathered rocks exposed above the ice surface contain iron concentrations up to ten times higher than previously reported from the Antarctic continent. This bioavailable iron is transported to the ocean by glaciers
December 2025
