When launching a RHIB, which step must be taken first?

When launching a RHIB (Rigid Hull Inflatable Boat), the first step is to release the hook. This is crucial because the RHIB is typically secured to the launch platform by a hook or other securing apparatus. Releasing the hook allows the boat to be freed from its restraints, which is necessary before any further launch procedures can take place.

Without first releasing the hook, the RHIB cannot be lowered safely or launched, as it would still be secured to the vessel. Once the hook is released, the crew can proceed with casting off other lines and lowering the RHIB into the water. This step ensures that the operation starts correctly and safely sets the stage for the successful launch of the boat.