WBUR: Moving in
WBUR: On Chelsea Creek
WBUR: From the pilot house
WBUR: Fuel tanker on river
WBUR: Starboard
WBUR: Misty morning
WBUR: Double-hulled
WBUR: Threading a needle
WBUR: Snugged up
WBUR: Thirst for fuel
WBUR: Ballet of big boats
WBUR: Guidepost
WBUR: Tugboat captain
WBUR: At the helm
WBUR: No margin for error
WBUR: Just making it
WBUR: Gunwales
WBUR: Tugboat names
WBUR: Naming a tug
WBUR: Aptly named
WBUR: Where they work