NSIDC:
Warming tent
NSIDC:
USS Hawkbill
NSIDC:
Exposing the hatch
NSIDC:
USS Hawkbill surfacing
NSIDC:
DN-ST-92-00859
NSIDC:
stamp-ArcticExplore-1959-wikipedia
NSIDC:
photo-uss-nautilus-navy-jan-21-1954
NSIDC:
data-G01360-submarine-tracks
NSIDC:
paper-arctic-ice-thickness-kwok-rothrock