The U.S. Coast Guard Cutter Healy makes its way through the Puget Sound Thursday, Oct. 29, 2015, on its way to their homeport of Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
Coast Guard Ensign Jon Lash, left, and Boatswain's Mate Jim Bowell talk about marine traffic ahead in the bridge of the U.S. Coast Guard Cutter Healy as it makes its way through the Puget Sound on its way Thursday, Oct. 29, 2015, to its homeport of Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
A small U.S. Coast Guard boat pulls alongside the Cutter Healy to drop off passengers as the icebreaker makes its way through the Puget Sound on its way, Thursday, Oct. 29, 2015, to its homeport of Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
A lookout on the bridge of the U.S. Coast Guard Cutter Healy keeps an eye on marine traffic ahead as the icebreaker makes its way into Elliott Bay Thursday, Oct. 29, 2015, in Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
The U.S. Coast Guard Cutter Healy is guided into port and in view of the docked Cutter Polar Star, left, on its arrival Thursday, Oct. 29, 2015, in Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
U.S. Coast Guard Petty Officer 2nd Class Colin Edwards kisses his son, Hugh Edwards, 2, aboard the Cutter Healy on the ship's arrival to the port, Thursday, Oct. 29, 2015, in Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
U.S. Coast Guard Chief Petty Officer John Jackson is helped with his new hat by his wife, Jessica Jackson, as his promotion is recognized aboard the Cutter Healy during a ceremony for the crew on their arrival to port, Thursday, Oct. 29, 2015, in Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)
A crew member raises a "12th Man" flag, symbolic of support of the Seattle Seahawks, aboard the U.S. Coast Guard Cutter Healy as it makes its way through the Puget Sound on its way Thursday, Oct. 29, 2015, to its homeport of Seattle. The 420-foot polar icebreaker, the country's newest high-latitude vessel, returned to Seattle after cutting its way to the North Pole in support of a mission to study the health of the Arctic Ocean. The ship is capable of breaking more than 10 feet of ice. (AP Photo/Elaine Thompson)