There are many levels in which there are more men to save than visibly obvious. Be on the look out for debry falling from the inside of rock formations as well as objects that visibly block portions of your path (ex: rocks, barrels), or even floors that will drop out with the pulling of a ring or lever. You have to be quick and jump into the hole before floor bottom returns or, in the case of barrels or rocks, you simply have to walk behind the object and press the down button. You will find that you can find the men that you knew you had but could not find!