<div class="description">
<ul><li><b>Scope and content:</b>  Original Caption: With the American Naval Forces in France. Dug-out built in a French port to protect the American sailors from bombs dropped by German pilots. The roof is made of corrugated iron set in concrete, ten feet underground, an air space is then left to absorb the shock. A second layer of concrete is surfaced with granite blocks to resist bomb concussion. These are piled high with sand bags and topped off with a heavy roof of thick boiler plate.</li></ul><p>Date Taken: 6/1/1918
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Photographer: Kadel &amp; Herbert</div>
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Unknown author<span style="display: none;">Unknown author</span> or not provided</div>
<a href="https://en.wikipedia.org/wiki/U.S._National_Archives_and_Records_Administration" class="extiw" title="en:U.S. National Archives and Records Administration">U.S. National Archives and Records Administration</a>