Why take the train?! Why drive?! Swim the classic route.
Can be swum as part of an organised group in September. Otherwise - safety boat and permission to be organised with port authority - busy shipping lane with huge oil tankers using it.
Swim goes from south to north, with views of the stunning bridges. A mixture of fresh (river) water and the sea.
This is a crowd-sourced map. Abilities vary, and conditions change. Always assess risks for yourself before getting in.