Rhea sighed. He was right, they should do something soon. So she climbed into the tank with the boy. It was rather cool against her skin but she barely had time to reflect on the feel of the water. She pointed her wand at her face and muttered"Viseo Ebullio" She knew she would probably only have enough oxygen for about two minutes but she was sure that the others would be their to go down when she came up. She looked to prefect sarah, hopefull they were on the right track and doing the right thing.
She sunk beneath the surface and pointed her wand to the trunk muttering a strong alohomora" hopefully that would work. She looked across at the boy also under water. Maybe their combined efforts would work.