The last 40 or so years have produced plenty of histories and memoirs of both the U.S. and Soviet/Russian space programs. Some are great, some are good and some are not so good. In some regards, Into That Silent Sea is unavoidably duplicative of some of those works. It is just the nature of the beast. Regardless, there is undoubted benefit in having authors unassociated with either program examine just how enterprising and daring those early missions were. Many people today seem to view space programs as an extravagance or with disinterest. For those who remain interested in those programs and have read the prior histories and memoirs, it never hurts to be reminded of just how pioneering the first steps were.