Can any character escape Impel Down alone, assuming they easily leave their cell? Do you think the Strawhats without Luffy could?

[Warmmedown]

Do you think anyone could, if Magellan, his beasts and wardens are trying to stop them? They get out of their cell and have to reach a boat on the outside.

 

[SSJ2]

Helmeppo easily. One burst of Haoshoku and everyone is saying goodnight.