Airships were surprisingly hard to shoot down in World War II

Zeppelins, as it turns out, are slightly more durable than your average dollar store water balloon. Maybe that's why they were a staple of the U.S. military of the time. The Hindenburg Disaster aside, 20th-Century airships were built to go the distance – and they did.

The United States was the only power to use airships during World War II, and they used them to great effect. Some 89,000 ocean-going ships were escorted by K-series airships during the war, and only one was lost to the enemy, the Panamanian oil tanker Persephone. The U.S. used them in both theaters of war, conducting minesweeping, search and rescue, photographic reconnaissance, scouting, escort convoy, and anti-submarine patrol missions.

The massive hanger No. 2 near Tustin, California filled with six airships. Each airship is nearly 250 feet long.

For their anti-submarine missions, K-class airships were equipped with two .50-caliber Browning M2 machine guns and 4 Mark-47 depth charges. The ships flew on helium (the Hindenburg was filled with hydrogen, and thus became a fireball), which the United States had a monopoly on at the time, and was able to operate them safely. Airships were not just a child's balloon, they were made with solid, vulcanized rubber to hold air in. But just shooting a blimp wouldn't take it down, their gas bags were much more effective and could take a few shots.

Other airships that were used by all forces included barrage balloons. These unmanned aerial vehicles pulled double duty in both obscuring the target cities or ships from incoming fighters and bombers while protecting the area around them using the metal tethers that kept them attached to the earth. The tethers would tear through enemy aircraft as they attempted to buzz by the balloons.

A Navy K-class airship at Gibraltar, 1944. The 1400-foot Rock of Gibraltar is in background.

For the entire duration of the war, only one K-ship was ever lost to the enemy. K-74 was shot down by a German U-boat in the Straits of Florida in 1943. Of the 10-man crew who went down in the airship, nine survived, and the only lost crewman was eaten by a shark awaiting rescue. The U-boat was assaulted by Allied bombers trying to limp back to Germany and was sunk.

The Navy continued to use blimps to patrol the American coastline until 1962, despite their unique abilities to stay aloft for more than a day at a stretch and the ability to sniff out submarines better than any alternative at the time. The U.S. even tested the effects of a nuclear blast on its K-ships, believing it could be armed with nuclear depth charges.