It took around 30 hours for emergency teams to be able to reach Philip Goodeve-Docker's team and airlift them to safety but Mr Goodeve-Docker died before their arrival.
The London events manager was on the unsupported crossing with experienced expedition leader Roan Hackney and Andy Norman, a former IT professional, who both remain in a "critical condition" in hospital.
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Khan, the Labour MP for Tooting, claims his plan to hold fares at 2016 prices until 2020 is fully costed.
Lee Drake smashed into a moped in Poplar in June 2014, after going through a red traffic light with blue lights on but no sirens.
More than a decade after their daughter's death the Dowler family were given these harrowing details of their daughter's last hours.