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Of course, they won’t be yellow when they get operational, but the Navy quietly marked a milestone in undersea warfare: the successful forward-deployed launch and recovery of the HHI Yellow Moray uncrewed underwater vehicle, a variant of the company’s REMUS 600 series UUV, from the USS Delaware (SSN 791), a Block III Virginia-class submarine. In a further note, Delaware was the first American warship commissioned while underwater, making her the ideal historical testbed for such devices.

250501-N-N0736-1001 NORFOLK (May 01, 2025) – Sailors attached to the Virginia-class fast-attack submarine USS Delaware (SSN 791) lower a Yellow Moray (REMUS 600) unmanned underwater vehicle (UUV) into the water during a UUV exercise in Haakosnsvern Naval Base in Haakonsvern, Norway, and then swim it to the sub. (Courtesy Photo)

Via DOD:

The Yellow Moray UUV executed a pre-programmed mission profile showcasing the potential to greatly enhance the Navy’s subsea and seabed warfare (SSW) capabilities. The successful completion of this mission demonstrates the feasibility of deploying robotic and autonomous systems from submarines, opening new possibilities for clandestine operations and battlespace preparation. As part of this operation, Delaware executed three Yellow Moray UUV sorties of about 6-10 hours each using the same vehicle, validating the reliability of the system and the ability to execute multiple missions without the need for divers to launch and recover the vehicle.

But wait, there is more:

This deployment also highlighted the ability of the Submarine Force and UUV Group 1 to learn fast and overcome barriers. During the first attempts to launch and recover in a Norwegian Fjord in February, the vehicle failed to recover to the torpedo tube after multiple attempts. After recovering the UUV to a surface support vessel, technicians discovered damage to a critical part. To avoid impacts to the ship’s deployment schedule and operations, the Submarine Force (SUBFOR) shipped the UUV back to the U.S. and replaced the failed component. Knowing there was another opportunity to operate the system later in the deployment, SUBFOR returned the UUV to the theater where Delaware completed an expeditionary reload, and multiple successful UUV torpedo tube launch and recovery operations. As part of the expeditionary load, the team also executed a first-ever pierside diver torpedo tube load of the UUV in Norway, providing the operational commander with flexible options.

While the Yellow Moray itself doesn’t have much information, check out this backgrounder on the REMUS 620, its developmental “daddy”: