Steve Rogers infiltrates the
HYDRA Research Facility and freed the allied prisoners, allowing them to take the guards by surprise and overpower them by force of numbers.
While searching for
Bucky Barnes , who he eventually found strapped to a table in
Arnim Zola's laboratory, Steve encountered
Red Skull, who revealed himself to be a
Super-Soldier.
They were able to escape, but only after Zola are set off explosives accross the facility.