Passing through the Montlake Cut, the research boat struck the seafloor and a concrete wall, according to a NOAA spokesman. The estimated cost of damage remains unknown.

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A research vessel with the National Oceanic and Atmospheric Administration (NOAA) crashed Monday while passing through Seattle’s Montlake Cut of the Lake Washington Ship Canal, according to witnesses and a spokesman for the agency.

NOAA divers examined the ship and found damage to one of the propellers, plus hull dents and paint scrapes, and the incident remains under investigation, NOAA spokesman David Hall said in an email.

The boat, which the agency calls the Rainier, “made contact with the seabed and a concrete wall,” Hall said. No injuries were reported.

The estimated cost of damage to the ship is unknown.

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Patricia Graesser, spokeswoman for the Seattle District U.S. Army Corps of Engineers, said inspectors were at the site Wednesday morning and said there was “no visible damage” to the cut’s concrete wall. She said it is uncommon to receive reports of vessels hitting the channel’s walls and the corps’ chief of navigation would be speaking with NOAA officials to learn more about what happened.

The waterway, between the Montlake and University District neighborhoods, connects Lake Washington and Lake Union.

The ship, first commissioned in 1968, uses sonar technology to map marine conditions. It is 231 feet long and 42 feet wide, according to the agency’s website.

The site refers to the ship as “the most productive coastal hydrographic survey platform in the world.”