Rian's eyes widened slightly as the professor jumped into the tank. What a completely idiotic thing to do! she thought, but hopped right out of her seat. She hurried to the tank, and, finding a still-locked lock, grabbed it in her hand.

Okay...one, two, three...

"Alohamora!" She said, pointing her wand at the lock. She frowned when the lock stayed...well, firmly locked. Shaking her head, she cast the spell again, not knowing why it hadn't worked in the first place. She smirked slightly when it opened. Stupid lock, she thought as she watched the chain sink to the bottom of the tank.