Answer:

surface

Answer	Crossword Clue
SURFACE	Emerge
SURFACE	Come up for air
SURFACE	Kind of tension

SURFACE	Come up
SURFACE	Rise, as a submarine
SURFACE	Sub captain's command
SURFACE	"School for Scandal" hypocrite.
SURFACE	Character in "School for Scandal."
SURFACE	Seek the sea top.
SURFACE	Sir Oliver in "School for Scandal."
SURFACE	Exterior.

SURFACE	Come to the top.
SURFACE	Take the Nautilus up
SURFACE	Exterior boundary
SURFACE	Superficial
SURFACE	What a sub must do
SURFACE	Come out of hiding
SURFACE	Become apparent
SURFACE	Microsoft's answer to the iPad