Semiotics:
Denotation: The stacked barrels in the background feature yellow radioactive signs.
Connotation: This connotes danger and a possible safety hazard.
Denotation: The only colour used other than the title is on the radioactive suits.
Connotation: This connotes that the two men are somehow related to the radioactive barrels.
Denotation: The two men are standing in an upright pose.
Connotation: This connotes that they're confident and have intent.
Denotation: There are things falling from the sky in the background.
Connotation: The objects falling from the sky could be radioactive fallout or ash, this has connotations of an explosion or eruption.
Denotation: The first two letters of the title look like elements of a periodic table.
Connotation: There are scientific connotations.