An underwater forensics expert believes missing mum Nicola Bulley's phone may have been left by the river as decoy.
Specialist Group International (SGI) were drafted in by police yesterday to help trawl the River Wyre for the dog walker.
Founder Peter Faulding, who was yesterday pictured operating the firm's high-tech side scan sonar from a boat, said he is "truly baffled" by the case.