The company is part of the Shoal consortium, a European Commission-funded group from academia and business that has developed these underwater robots.
"At the moment, in harbours, they take samples about once a month," says Mr Speller.
"And in that time, a ship could come into the harbour, leak some chemicals somewhere, then it's gone, all the way up the coastline.
"The idea is that we will use robot fish, which are in the harbour all of the time, and constantly checking for pollution."