according to "precision trolling the 6th edtion(great book) a size 1 dipsy diver will go down to 68 ft max with 150 of 20 lb mono. at 2.5 mph. this book is great. did you know that a 1/2 oz. hot shot will get down to 23 ft with 220 ft of line out. but a hot 'n tot ( which many are using for divers) WILL MAX OUT AT ONLY 15 FT DEEP WITH 180 FT OF LINE.