Which line-pull sequence requests a square mark?

• A. 3-2 line pulls.
• B. 1-2-3 line pulls.
• C. 5 line pulls.
• D. 7 line pulls.

Answer: (B)

Line-pull signals underwater use distinct pull patterns to request specific marks from the surface team, so the shape of the mark is conveyed through how many pulls you perform. The square mark is signaled by a three-pull sequence, performed as three consecutive pulls in order. This pattern is the simplest, quickest way to indicate a square without needing longer or more complex sequences. Longer sequences, like five or seven pulls, are reserved for other marks or instructions, and a shorter two-pull or longer-than-three-pull pattern wouldn’t match the command for a square.