Iron Man (1968 1st Series) #218

"Deep Trouble!" Plot by David Michelinie and Bob Layton. Script by David Michelinie. Art by Bob Layton (pencils & inks) and John Romita Sr. (alterations). Cover by Bob Layton.

Tony Stark travels to London for a top secret mission from the U.S. State Department! The armored avenger is supposed to retrieve a deadly gas canister from the bottom of the ocean!