After being assessed by the diving doctor, and getting changed into the scrubs, the internal attendant will accompany the diver into the chamber. Once comfortable, the doors will be sealed and compression will begin. The internal attendant will monitor the diver and encourage equalisation of the ears. The chamber will become noisy as it’s compressed to 18m. Once at depth, the internal attendant will assist with fitting the O2 bibs, this will remain on throughout the treatment with set times for an air break. This is the opportunity to drink, eat, or go to the toilet. It’s also the opportunity to ask or answer any questions by the diving doctor. The treatment will be monitored via video and audio communications by the team outside operating the chamber. If the diver responds well to the treatment, they will arrive slowly at the surface.