First and foremost. Terminology.
In Water Decompression is where decompression is completed while in water. This is the standard mode of operation.
Sur-D = Surface Decompression this is where decompression on commercial and military dives are completed partially in-water and the rest in a "deck decompression chamber"
What you are looking to discuss here is: In-Water-Recompression (IWR)
This is where a diver did NOT complete decompression properly and requires "recompression therapy treatment." It is normally used in-place of hyperbaric chamber treatment when in remote locations or where the distance to a recompression chamber is so long that this "field treatment" would do more good than harm.
IWR is NOT an easy task. It requires an enourmous amount of support and should not be considered except in extreme emergencies.
More on it later.....