Detective Comics #11

The fleet is at anchor in New York Harbor. A plot is uncovered to destroy the reef at the harbor entrance, thus stranding the ships. Speed puts on a diving suit and gets dropped from a plane near to the reef. On the sea bottom he finds a submarine and enters through a hatch. He holds the saboteurs at gunpoint, but they overpower him, tie him to a post and escape. With the clock ticking down, the sub begins to surface. With only a minute to go, Speed escapes the sub just before it blows up. No damage has been done.