The first steel on the Olympic Stadium has been erected to 35m above ground, as shown in new images released last week.
Steel terracing supports, each weighing 35t, are being lifted into place above the podium level to hold the 55,000 seats in the upper tiers. Work also started last week on the south stand and 112 of these rakers will be put up around the Stadium podium over the next nine months.
Olympic Delivery Authority chair John Armitt said: "People will now start to see the skeleton of the Olympic Stadium from miles around, giving a real indication of the sheer size and scale of this flagship venue."
Fabricator Watson Steel is delivering the steel in sections from its factory in Bolton to the east London site.