GWX models surface attacking wolfpacks only. The boats will probably have been killed beween the time that the convoy renders and when you are about to hit the convoy but this can be dependant on whether or not the escorts are able to knock them out before you reach the convoy.
In some circumstances they may not do so and you may be able to get close whilst they are still attacking.
Unfortunately SHIII does not allow AI subs to submerge if starting on the surface or surface if starting submerged so once they attack they are committed to their course of action and cannot change their depth.
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