Downstream

porpoises, whales, otters and
sharks. An important trade
and transport route since
prehistoric times, it has
carried passengers and goods
from and to all over the world
in boats of all shapes and
sizes. We have rowed, sailed,
canoed and punted along it;
we’ve held regattas and
aquatic carnivals, played
water polo and skated over its
frozen surface. But what of
its swimmers? What of all