Final answer:
The line pull signal 2-1 from the diver means the diver should ascend to a shallower depth, usually to a depth of 21 feet.
Step-by-step explanation:
The meaning of the line pull signal 2-1 from the diver
In diving, a line pull signal is a means of communication between the diver and the surface team. The line pull signal 2-1 indicates that the diver should ascend to a shallower depth, usually to a depth of 21 feet.
This signal is important for the safety of the diver as it communicates a specific action to be taken. It is crucial for both the diver and the surface team to understand and use accurate line pull signals to ensure effective communication and a safe diving experience.