The plans for giant seaweed farms in European waters
The seaweed in the pilot test was harvested by a mechanical arm
At a testing site way off the Dutch coast a breakthrough was made this summer.
Some 12km (7.5 miles) out at sea, a converted fishing boat mechanically harvested a batch of farmed seaweed.
The kelp had been grown on netting hanging below a 50m (164ft) long plastic tube that was floating on the water, held in place by buoys and two anchors on the seafloor.
The boat was positioned alongside, and an 8m tall, electric-powered cutting arm was moved into the water.