As training cruiser, the Katori-class are designed to be equipped with various type of the latest engines

They are equipped with both steam turbine engine and diesel engine

Steam turbine need to wait until the water in their reservoir is boiling before they can move

It's thanks to this reason that Katori could quickly raise anchor and escape the atol

during the air raid in Kwajalein on Febuary Showa 17th

Well, you see, we're not diesel engined, so we have trouble waking up can't just wake up like that