The Trump administration wants to install floating border barriers that could be used to wall off river crossings and reservoirs along the international boundary with Mexico or extend U.S. fencing deeper into the sea, according to a new market solicitation posted by the U.S. Army Corps of Engineers.

The “Buoy Barrier System” described in a new federal contracting bulletin seeks information from private companies capable of installing a system that could meet U.S. Customs and Border Protection requirements. Such a barrier would need to prevent swimmers from climbing onto it, “and must include a component (such as an anti-dive mesh) that would impede incursions and/or breaching via underwater diving while minimizing debris buildup,” the solicitation states.

President Donald Trump’s $15 billion border wall project includes about 275 miles of newly completed barriers thus far, and Department of Homeland Security officials say they are on track to finish another 175 miles by the end of the year. The floating barriers described in the contracting bulletin would be in addition to those on dry land.

Such floating barriers or river-based deterrents could allow the U.S. government to block migrants from fording waters along stretches of the Rio Grande where it is difficult or impossible to build steel barriers on the shoreline. It also could provide the U.S. government a way to install some form of a barrier in areas of Texas where private owners have resisted efforts at eminent domain seizures or proposals to build structures and roadways on their properties.

John Mennell, a CBP spokesman, said the purpose of the solicitation is to gather information from private industry about the feasibility of the project.

The U.S. Border Patrol, Mennell said in a statement, is seeking to “impede and deny illicit activity in waterways, including but not limited to rivers, lakes, and ponds, where use of traditional land-based barriers are not practical.”

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The Rio Grande comprises about two-thirds of the 2,000-mile international boundary with Mexico, and during certain times of year there are places along the river that are shallow enough for people to walk or wade through. Along the busiest stretch for illegal traffic, closer to the river’s terminus in the Gulf of Mexico, migrants and smuggling guides typically paddle through dangerous currents using cheap inflatable rafts and flotation devices, often at grave risk.

Salvadoran migrant Óscar Alberto Martínez Ramírez, 25, and his 1-year-old daughter Valeria drowned last summer trying to swim across the Rio Grande near Brownsville, Texas, and the images of their bodies face down along the banks brought renewed attention to the perils facing desperate migrants.

U.S. Border Patrol agents performed 742 water rescues last year, according to CBP data, and the agency recorded 66 drownings. The incidents also occur along the All-American Canal in California’s Imperial Valley, and in the Pacific Ocean, where the steel border fencing extends 300 feet into the crashing surf.

A buoy-anchored barrier system could stretch that barrier further out, or could block off popular crossing points along the Rio Grande.

The engineering and hydrological challenges of such a project would be significant. A floating barrier anchored in the river channel of the Rio Grande is likely to clog with flood debris during storms, and a system with underwater netting to block swimmers in the ocean could become choked with seaweed and other detritus.

The installation of barriers in the river channel likely would require approval from the International Boundary and Water Commission, the joint U.S.-Mexico body that regulates construction and other activities along shared waterways at the border.

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The Army Corps declined to comment, referring inquiries to CBP.

The solicitation does not include any images or sketches of possible barrier designs, and there is no indication the floating barriers would include components to prevent drownings. The specifications call for a design that would prevent swimmers from climbing up onto the structure.

Mennell said its purpose would be to discourage migrants from entering the water on the Mexican side of the border to even try crossing to the U.S. shoreline.

“Waterways along the southwest border present a danger to migrants attempting to illegally cross the border,” he said. “Smuggling organizations guide vulnerable families and children to these waterways that may appear placid on the surface, but have dangerous currents and other dangers beneath the surface.”

“The water barriers are expected to improve agent safety by providing an added level of impedance, denial and deterrence in waterways at the immediate border,” Mennell said.

CBP wants the floating barrier system to allow agents to spot attempted breaches “and withstand attempted breaches against any sophisticated equipment designed to breach such a barrier,” the bulletin states.

In one indication of the structural challenges to keeping such a barrier from being swept away, the solicitation states that its anchoring system should be “rated to withstand up to 25 metric tons” of force.