Mary:

It mostly has to do with the "finished attitude" the hulls end up in. If the boat has gone fully turtle (Mast straight down) then the most common system for righting the boat is:

Cut away all halyards
Drop or cut away the sails
Submerge one of the hulls by flooding the boat by opening seacocks
Pull the boat with a frigate or tug boat slowly to an angle where the mast is well passed parrallel the water and then inflate expansion bags with CO2 cartridges that were placed in the hull prior to the final step.
Last but not least get the gunwhale bilde pumps going. Drag to a yard with empty hulls and crane out. Save what you can. Buy new sails. Replace all standing rigging. Wash out underwear. Go back out sailing.

Mark Michaelsen