Escaping the grotto (3) (Patreon)

Previously:

https://www.patreon.com/posts/86955129

As Penny takes a look around the secret base, she finds a few air tanks to help her escape the grotto for good...except the only spare air tank she found was...barely empty!

This situation is all familiar to Penny, but even if the tank seems almost out of it, she will still take her chances. She managed to do it before, she can always do it again...right?