Sorry to stray from non-diving related discussion:  :-)

From the Royal Navy Diving Manual, 1972

"1.  Shark attacks on man seldom take place in areas where the water
temperature is less than 20 deg. C., and of the hundreds of varieties of
shark there are probably only eight dangerous to man.  However, it is
prudent to take precautions when operating in shark-infested waters and
employ shark repellent compound.

2.  Explosive charges should never be used to frighten away sharks as they
are attracted to the killed or stunned fish and associate a detonation with
feeding.  Diving in shark infested waters should take account of local
conditions and advice when available.  There is no recorded attack by a
shark on any Royal Navy dresed diver, but the following precautions should
be taken:
a.  Always wear a suit (a blue undersuit or a pair of dark overalls is
sufficient).
b. Avoid diving in areas of bad underwater visibility whenever possible.
c.  Avoid any unneccessary splashing or delays on the surface.
d.  Do not panic when first sighting a shark.  Almost invariably they swim
away from a diver.  Get out of the water as soon as possible, without
creating a disturbance by too much haste.
e.  A movement toward a shark will often make it swim away, but this
technique comes only with practice under shark conditions.
f.  Never enter or remain in the water with a bleeding cut or wound.
g. When operating from a ship close heads and gash chutes well before
entering the water.  Whenever possible, avoid areas where scavenger sharks
may exist, such as offal dumps, busy anchorages where gash is continually
ditched, etc..
h.  The killing of fish by any method is apt to attract sharks."

It was obviously written by a coy, non-diving bureaucrat!  No mention of
*not* peeing in the water! :-)

Funnily enough the only other critter to get a mention are sea-snakes:

"4.  If bitten, a diver should be given medical attention immediately."
:-)

There's some good, pragmatic, stuff in those old manuals! :-)

Strike