Hi, exactly as you say. In water emergency recompression is fraught with difficulties and hazards associated with the environment and monitoring:
PO levels in a chamber can be higher than acceptable in water as a spasm in a chamber is not life threatening but can lead to drowning in water.
Assistants and monitoring staff must also be in water with patient putting them in harms way and making their job difficult; meds are extremely difficult to administer, hydration is difficult, body temp difficult to maintain especially if patient is unconsious.
Careful planning and use of correct equipment can help or minimise some of these issues but cannot make it anwhere near as safe or effective as chamber treatment.
If it's the only option you have it can and has worked but no professional organisation is going to stick its neck out and recommend it