Answer: portholes

AnswerCrossword Clue
PORTHOLESShip's windows
PORTHOLESOpenings in a wall.
PORTHOLESSome allow you to see the sea
PORTHOLESWater is visible through these
PORTHOLESWhat submarines lack
portholesAn opening for firing a cannon through
portholesPORTHOLE, a small window in a ship's side
portholesA small exterior window in a ship or aircraft