Over the next 12 months, the team at Tritonia, building on existing environmental data sets, will develop a digital record of the hard substrate found near selected Mowi sites, using a technique known as georeferenced photogrammetry. Compared to soft seabed, where samples of sediment can be taken regularly and easily, monitoring hard substrates can be challenging because of the low visibility of the water even when using divers or drop-down cameras to assess the terrain. The hard nature of the seabed makes it near impossible to grab samples.