This is a very interesting, straight to the point book.
I have been interested in the origins of helmet diving for many years and John Bevin has described it in a way most readers will understand.He does not pull his punches when describing the non diving obstacles, for example the unscrupulous businessmen, that the Dean brothers, especially John, had to overcome during their careers.
When reading about the diving itself you feel like you are at the bottom of the sea with them!The Dean brothers were brave and resourceful men and this book is a credit to the men who changed the world of underwater salvage forever.