>Are your signal nodes ordinary relays or are you talking about some kind of ansible-like system?
Some kind of system to pass along a signal/boost the signal so that there is as little delay in commands as possible.
>An unmanned sub with an unlimited power source has no need of an anchor
>What kind of power-to-weight ratio are we talking about here?
Well the idea with this is that it will be constantly recharging, which doesn't necessarily mean it will be able to operate 24/7, just that it can be in the field indefinitely.
The anchors would be needed to keep it in place long enough for it to fully charge on a regular basis, or in case of emergency low power so that it doesn't become lost when on mission. And as for the power ratio, it would need a "transmission" of sorts via capacitors, inverter's, converters, gears, cranks, etc to translate low but numerous wattage into powerful volt driven equipment. With a device like this (albeit complex) it would be able to just putt around or kick it into high gear when needed. I may make a drawing of some kind to explain this.
As for the reverse parachute and ballast idea, a combination of both would be optimal, please keep in mind when I say reverse parachute, I mean the kind that divers use to take objects to the surface (basically an underwater parachute that catches air and is driven up by it)
In terms of stealth the undersea probe would be the easiest to work with in terms of stealth and capability since visual and audio surveillance will at the very least be in effective, or outright useless under certain conditions, and it can be painted with anti radar coatings like the F-22 so that it's pretty much a ghost.
For defenses and counter measures, since energy isn't a big issue it could be made larger and more durable (as in not caving from a depth charge blast) and with the proper inverters, coatings, and hull design it could likely just scoot the fuck away and disappear into the dark, or justPost too long. Click here to view the full text.