DIVER'S NEED is a term used to describe the essential items that a diver needs in order to safely and effectively dive. The three crossword solutions for this term are AIR (3 letters), AIRLINE (7 letters), and MASK (4 letters). AIR refers to the AIR that divers breathe while underwater, which is typically supplied from a tank or other AIR source. AIRLINE is the hose or tube that connects the AIR source to the diver's MASK. Finally, MASK is the piece of equipment that covers the diver's face and allows them to see underwater.