Families of the July 7 victims have been shown CCTV footage of the suicide bombers on a reconnaissance mission to London before the attacks.
The inquest into the deaths of the 52 people killed in the 2005 atrocities saw grainy footage of ringleader Mohammed Sidique Khan, Shehzad Tanweer and Jermaine Lindsay as they travelled on the Underground system, apparently unconcerned their activities could be caught on camera.
The bombers were also caught on CCTV buying the final supplies for their deadly mission in the days before the attacks. They purchased pliers and light bulbs at a B&Q hardware store and made an early-morning visit to an Asda supermarket for bags of ice to keep their homemade bombs cool.
Plot ringleader Mohammed Sidique Khan was also filmed visiting Dewsbury Hospital in West Yorkshire with his heavily pregnant partner, Hasina Patel, two days before the attacks.
Counter terrorism police investigating the attack quickly spotted the bombers on CCTV as they arrived in London because of their suspicious behaviour.
A former soldier working for Scotland Yard's Counter Terrorism Command raised the alarm just four days later when he saw footage of the four men walking through King's Cross in pairs and carrying rucksacks.