Gone too deep (Patreon)

Commission by a twitter user!

When swimming by herself at the ocean, Isabella Garcia (Phineas e Ferb) didn't realized she was way too deep in the ocean. She tries to swim back up, but her body was quickly giving up on her.

Thankfully for her, she managed to get rescued by what appears to be a...uh...a platypus? Either way, she learned to be more carefull next time.