The Devil of the Deep was an aquatic-themed Nazi sympathizer who terrorized America. From his Black Barge he could conjure powerful storms and tidal waves to strike coastal cities. He was foiled by the Flame but escaped to plot another day.
References: [The Flame #8] [1942] [nazi villain; “Scum! Lice! Insects! I shall drown them all! Heil Hitler!”; can generate tidal waves; can also generate storms; AKA “Master Devil”, by a subordinate; operates from the Black Barge; foiled by the Flame but escapes; ]
Metahuman Database 