[kpil]

As long as it not fills with water, I'd say it will right it self.

On a traditional boat the sails can dig down in the water and needs to be released rather quickly, and you don't want the hatch to be open, but neither of this seems to be a problem here.

[usrusr]

Theoretically, a sailing sensor drone could even be constructed as a submarine, sailing on the surface in regular conditions but able to dive into the currents if conditions get too harsh. It would not be able to maneuver or communicate while submerged, but it could resurface on a timer, or use sensor data to identify to make an educated guess. (This could also qualify as a piracy countermeasure, should the drones get targeted for parts)