Do the crossword puzzle. clues across 1 a man-made underground passage through a hill or under a river. 5 букв 2 a place to hide in a mountain. 3 буквы 3 to put things on the boat. 3 буквы 4 very big. 7 букв 5 difficult to walk or stand on because it is wet. 7 букв clues down 6 a special underwater boat. 8 букв 7 an optical instrument with a lens fir each eye used to look at far-away objects. 9 букв