Archaeologists today began investigating the history of the Olympic Park site.
Experts from the Museum of London expect to find evidence dating back to prehistoric London, through Roman, Viking and medieval times and up to the Second World War.
They will search under the topsoil, rubble and rubbish that has built up since the area was filled for industrial use in the 19th century.
Areas for special investigation include Hennikers Ditch, a medieval waterway, and Channelsea River, reputedly dug by King Alfred in the the late 9th century to divert Vikings away from the City of London.
ODA Chief Executive David Higgins said: "This is an opportunity to chart and record the unique history of the area back to the first Londoners before it is given a new lease of life for the Games and future generations.
"Work will be carried out by experts and hopefully more clues to the Lea Valley’s past will be found.
"We are starting well ahead of the planned start of construction and nothing is expected to be found that could affect our timetable."
26 April 2007
Read the full media release