London 2012 Olympics

http://www.telegraph.co.uk/sport/olympics/news/9213256/Olympic-warship-plan-sinks-over-safety-concerns-sparking-diplomatic-row.html

Officials are concerned the spectacle of the barge, which would have carried the Olympic flame, would lead to overcrowding, traffic chaos and could even lead to spectators throwing themselves from bridges.

Has no-one seen a boat before ?

"carrying the flame from Tower Bridge to the stadium in Stratford."

How? i can only see that it will travel about 500m then have to dock to carry it up to the stadium.