{\an8}with a ferocious lookingtoothed cutter-headon the end, which gougesthrough the river...

{\an8}with a ferocious looking
toothed cutter-head
on the end, which gouges
through the river bed. [narrator] For
accurate dredging, a 70-foot long metal piling, known as the digging spud, keeps the stern in place, acting as a picot. While a system
of cables and anchors moves the entire dredge
and cutter-head
from side of side, carving out
the sediment below. The debris is then
pumped on to barges
for disposal. {\an8}[Simon] Once complete,
the new channel
would be wide enough {\an8}for some of the world's
largest supertankers {\an8}to load up with crude oil
for shipping
all over the world