Swim Etiquette the unspoken rules

Experienced drivers know that roads are safer and more efficient when everyone observes a few common courtesies and basic rules. Such things are even more important when there are no explicit signs or signals to tell everyone what to do.

If you catch the person in front of you and wish to overtake then the overtaking swimmer should gently but distinctly touch the feet of the swimmer being overtaken.  It may take two or three touches, but overtaking swimmers should not need to repeatedly slap or grab at the legs of a slower swimmer to politely make their presence known.

A lead swimmer who feels a touch on the feet from an overtaking swimmer, should continue to the next wall, then stop in the corner of the lane to let faster swimmers past.  A single light touch may be accidental and can be ignored, but two or more distinct touches should be regarded almost universally as a request to swim through.

Swimmers enjoying a draft behind a strong lead swimmer, but who are just barely able to hold that pace should think twice before tagging the leader's toes and requesting to move ahead.  In such situations, it's highly unlikely that the (formerly) trailing swimmer will be able to hold the same pace for very long when leading without the draft.  This can lead to repeated "leap-fogging" and unnecessary contact, which can be annoying and disruptive for everyone in the lane.

Drafting swimmers not wishing to pass should swim far enough back from a lead swimmer that they don't inadvertently touch the lead swimmer's toes.

The swim is a zig zag and you have to go under the lane ropes so if you can on your turn around dive under rope not stop and get under this will make for a faster swim. 

There will be swim marshals observing and if they deem that you have not given way when needed and are holding the lane up you will be shown a Give way sign. You must stop at this point, if you ignore this you will be penalized by a timing penalty.