Which lifeline is required for standby diver and when direct access to the surface is not available?

• A. Buddy line
• B. Tending line
• C. Float line
• D. Rescue line

Answer: (B)

When a standby diver must work with no direct path to the surface, a tethered lifeline from the surface team is essential to maintain contact, control, and rapid recovery. The tending line is this tether. It keeps the standby diver connected to the surface crew, allowing constant awareness of location and depth, and gives the surface tender a direct means to guide, monitor, and retrieve the diver if conditions change or an emergency arises. Proper management of the line—keeping it taut, preventing snagging, and coordinating pulls or supports—is what makes this setup effective in restricted-access scenarios.

Other lines serve different purposes but don’t fulfill the same role in this context. The buddy line is primarily for maintaining contact between divers, not for surface-to-diver control when the surface isn’t reachable. The float line helps with surface location or signaling but doesn’t provide the controlled, protective tether needed for a standby diver under restricted access. The rescue line is reserved for emergency retrieval of a casualty and is not the standard lifeline used for routine standby operations.