Detectives say data could help them "pursue other significant lines" in search for Vitoria Barreto.
Police also believe a boat Vitoria Barreto may have taken is missing a buoyancy aid.
Police said a man was taken to hospital with serious head injuries and another suffered stab wounds.
Firefighters are working with a local farmer to try to stop the flames from spreading further.
An inquest into the death of Gavin Kennedy is suspended while police continue to investigate.
Both of the men's families are being supported by specialist police officers.
The route was closed in June while work was carried out by Derbyshire County Council.
The county council says "complex" work has been ongoing since June .
Swifts fly to the UK to mate, but a wildlife trust says their nesting spaces are being blocked up.
