coast guard captain rebecca orr will soon take command of the sector that includes this massive port. >> we're making sure that ships are where they're supposed to be for monitoring these things ons radar as well as voice communications and just looking for anything unusual. >> reporter: the tankers all have double-walled hulls reducing the danger of an oil spill. and although it looks crowded out here, orr says only about half of the parking spaces are occupied. >> so we have lots of room for these ships. >> when i think about it these could be good terrorist targets out here. >> sure. anchors all around us are open to recreational track. if we do aviation patrol from a helicopter we can see if there is anything that looks unusual. >> reporter: the perspective from the water really gives you an idea of how big these oil tankers are. but one of the best views of all of these ships is actually from a room back on shore. >> an miami bay for l.a. dump site number two. >> reporter: it's the marine equivalent of an airline control tower. >> we keep them from bumping into each other just li

. >> did you see anything -- >> reporter: coast guard captain rebecca orr will soon take command of thehis massive port. >> we're making sure that ships are where they're supposed to be for monitoring these things on radar as well as voice communications, looking for anything unusual. >> reporter: the tankers all have double-walled hull its, reducing the danger of an oil spill. it looks cruded but only about -- crowded but only about half of the parking spaces are occupied. >> we have lots of room for these ships. >> reporter: these could be good terrorist targets out here. >> sure. the acreages around us are open to recreational vessel traffic. if we do an aviation patrol from a helicopter, we can see if there's anything that looks unusual. >> reporter: the perspective from the water really gives you an idea of how big these oil tankers are. one of the best views of all of these ships is actually from a room back on shore. >> departing -- >> reporter: the marine equivalents of an air traffic control tower. >> we keep them from bumping into each other by watching on our screens just lik