Would it be feasible to develop an underwater based drone to target river crossing logistics?
I'm thinking of something that can be deployed a fair distance upstream or downstream of the targeted river crossing. The drone would need to carry a fairly significant payload for a serious bridge but pontoons and ferries would go down easy and you could always deploy multiple to work as one to target a specific point on a bridges structure to bring it down. It would have to be able to traverse shallow waters and be as undetectable as possible.
I think a crude version could be made by Ukraine even if it has to be piloted until the last stretch instead of autonomous. If mexican cartels can make submersible coke transporters I think Ukraine could pull it off. Thoughts?