Submarines are interesting because you also use them for other things like covertly delivering people to places you want. Airborne delivery...some of the science missions require us to dip transducers into the water in the Arctic. From a technical point of view we can solve that problem. If there's a need that somebody wants to take that approach you can do transducers as you would drop sonar buoys from a Sea King.
With imaging systems under the water that's where satellites work well because weight detection is one of the cool things you can do. Specifically you need to look—it depends on a lot of different conditions—at normal visual. If it's in the Bahamas you can see in the water easily. If it's off the coast of St. John's it might be a little harder to see. Turbidity and all those things do impact your ability to see, which is often why—from our ASW piece in the manned world—we're dropping sonar, listening, and then being able to triangulate, detect that way. If those systems are small enough then you can deliver. It doesn't matter whether there's a pilot on board the delivery system.