Robby Shelby is the son of Helen Shelby. He was responsible for the construction of the Supreme Barrier Reef.
When Helen and he were examining the reef, he was first to notice the acidic waters bleaching it. Inside the air pocket, he apologises to his mum for not building an escape pod into the reef, but Helen reminded him that she was responsible for the design.
Unfortunately, much to his mum's annoyance, Robby is 'father like son' as he is quite dramatic and has panic attacks. Also, he had a tendency to talk too much.
Robby Shelby appears in Deep Water, and was voiced by Marcel McCalla.