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