Enjoyed watching it. As a cave diver I was surprised to see the dive equipment and configurations used by the rescue divers. Definitely not the DIR setups I am use to seeing in Florida caves.
You have to remember that a lot of the caves they dive and explore are not the clear water (limestone) caves of Florida.
They are often minimal visibility, involving 'caving' to the sump, which can take hours. of climbing, crawling squeezing, and abseiling.
The kit is designed for durability, and to be repaired in the field.
I remember even seeing or reading an interview given by Dr Harris, about the first time he had meet Rick. Rick went to speak at a diving conference in Australia. He asked if he could dive the cave they where currently exploring during his visit.
He rocked up with his somewhat battered and utilitarian rebreather, put it to gather and disappeared into the cave to the alarm of the Australian hosts. Some hours later, Rick returned, having pushed line further into the cave.