When evaluating a scuba diving boat, prioritize the hull material, typically Marine Grade Aluminum 5083 or High-Density Fiberglass (FRP), for corrosion resistance. Ensure the design includes specialized dive racks for tank storage, a reinforced dive platform, and a heavy-duty boarding ladder (T-bar or fin-friendly style). For engine performance, verify the outboard or inboard motor horsepower is sufficient to handle the weight of full dive gear and multiple passengers while maintaining a cruising speed of 20-25 knots.