Recent attacks abroad — in London, Manchester and Tehran— as well as attacks at home, make us think of the ways in which we're all vulnerable.

Today, we suffer under the constant threat of terrorism. At this point, we're used to heightened security at the airport or at tourist destinations. But what about the threats that come on ships, over our waterways and through our ports? 

The US and North America have two large oceans. And obviously, that's a significant layer of defense from anyone who wants to get here, but it's not an impossible barrier. 

The World's Marco Werman wanted to get a taste of what the people who patrol those waters do and what their job is like these days. So, he joined the Coast Guard on patrol at their base, right here in Boston Harbor.

Listen to the full piece above.

The World's Marco Werman is shown here, driving in the Boston Harbor.

Sarah Birnbaum

From PRI's The World ©2017 PRI