I'm in no way a specialist on the matter, but here's what I remember:
Films that have been in water a long time tend to have VERY fragile gelatin. There can 
be also some color migration.
My advice would be to take some slides out, remove the possible drops of water by a 
light contact with a cloth and let
them dry like this.
For the strips, take some out very carefully, possibly by cutting the paper/plastic of 
the sleeve.
For rolls of films: if unexposed, throw them away. If exposed... you have a problem. 
Ideally, you should soak them for a
while, open them up in the dark, dry them in the dark, wind them back in. That's 
because the gelatin will stick to the
back of the film and tear if it's dry.
Good luck and try first.
-----------------
Guillaume Dargaud
CNR/IFA
http://sung3.ifsi.rm.cnr.it/~dargaud/Antarctica/
  "You've climbed the highest mountain in the world. What's left ? It's all downhill 
from there. You've got to set your
sights on something higher than Everest."    — Willi Unsoeld

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