India has more than 7,500 km of coastline and a vast maritime zone to watch, and the tools for the job are split in two.

Aerial drones cover the surface; underwater robots work below it.

Neither does both, so monitoring a coast usually means running two separate systems.

, a Bengaluru-based deeptech startup, is trying to collapse that into one machine.

Its drones fly like a quadcopter, land on water, dive to carry out underwater tasks, then resurface and fly on.