(U.S. Coast Guard Cutter Kimball/Facebook) A U.S. Coast Guard crew had a frightening encounter with a shark earlier this week as they were taking a refreshing dip in the Pacific.After completing operations for the day about a "zillion miles from land," more than 30 Coast Guard Cutter Kimball crewmembers -- along with an inflatable unicorn -- decided to take a much-needed break from the monotonous sea life and go swimming, according to post by the vessel's Facebook page on Wednesday.Download the FOX 5 DC News App for Local Breaking News and WeatherTheir fun would soon take a scary turn when the crew encountered and successfully warded off the estimated six- to eight-foot-long predator with their weapons.