Secrets Out (S02E10)

Before embarking on the final survey mission, Dianne discovers that Commander Byrne has chosen Froggy, Zoe, Joanne, Rocky, and Kimberly to join her crew. Meanwhile, Forsyth secretly plants a transmitter on the boat to enable UBRI to track it. UBRI divers are sent to capture Neri and Mera, but during their confrontation, the girls are caught on the boat's cameras, exposing their existence to everyone on board. When Mera calls for assistance, Charlie steps in, helping them escape; it’s the first time Mera has spoken to him. After learning about Neri and her sister, the kids agree to keep the secret, though Mick only says he’ll “think about it.”