I think that what they want is extremely ambitious, and may be very difficult to achieve.

They are looking at the vehicle being able to semi-autonomously deploy in the treacherous waters of, “rivers, inlets, harbors and other shallow waters,” burrow in the mud, and conduct surveillance.

It would need to navigate its way quietly through the frequently murkey, with turbulent currents and things like sandbars to further complicate things.

Additionally they want to be able to sleep for an extended time.

I don’t think that this is going to happen, but the the pictures are wicked cool: