What is the correct response to a three-line pull from the tender to the diver?

• A. Come up.
• B. I understand or Talk to me.
• C. Stand by to come up.
• D. Ventilate

Answer: (C)

The signal system between the surface tender and the diver uses line pulls to coordinate actions. A three-line pull is a directive that means the diver should stand by to come up—prepare for ascent but wait for the go-ahead. This gives the diver time to check depth, buoyancy, and safety checks, and it lets the tender control the pace of the ascent to stay in safe limits.

Why this fits best: it communicates readiness and intention without forcing an immediate ascent. It keeps the diver in a safe, orderly process, which is crucial when conditions or depth require careful planning before surfacing. The diver knows to prepare their ascent while awaiting the tender’s confirmation.

The other options don’t fit the signal meaning as well. A direct instruction to come up pushes the diver to start ascending immediately, which can be unsafe if conditions aren’t yet ideal. A statement like “I understand” or “Talk to me” is simply a communication acknowledgment, not a surface-going directive. “Ventilate” pertains to gas management and is not a surface ascent command conveyed by a three-line pull.