They're very prone to stress and so if you can sort of reduce that stress, then they're quite happy, relaxed seahorses. if they have a lot of stress, then they move back out to sea. the wildlife presenter steve backshall has dived here, and says boat anchors and mooring chains can damage the sea bed. they completely destroy all the substrate around it, which means that all the seagrass dies, and it gets rid of that binding substrate, which then washes away as sand. and so you just end up with these big, barren circles around all the moorings. and within that, nothing can live — and particula...