Only one enemy aircraft has ever dropped bombs on mainland USA - and that aircraft was a submarine-launched "Glen" floatplane. This book tells the story of the design, development and operational use of the E14Y1 "Glen".Included are details of earlier Japanese submarine-launched aircraft, and of the submarines designed and used as seaplane carriers. Profusely illustrated with photos, plans and color profiles - plus a description and photos of the only remnants of the E14Y1 still in existence, submerged aboard the hulk of the Akibasan Maru off Kwajalein Atoll in the Pacific.