It was weary work for Kotick.The herd never went more than forty or fifty miles a day，and stopped to feed at night，and kept close to the shore all the time；while Kotick swam round them，and over them，and under them，but he could not hurry them up one-half mile.As they went farther north they held a bowing council every few hours，and Kotick nearly bit off his mustache with impatience till he saw that they were following up a warm current of water，and then he respected them more.
One night they sank through the shiny water-sank like stones-and for the first time since he had known them began to swim quickly.Kotick followed，and the pace astonished him，for he never dreamed that Sea Cow was anything of a swimmer.They headed for a cliff by the shore-a cliff that ran down into deep water，and plunged into a dark hole at the foot of it，twenty fathoms under the sea.It was a long，long swim，and Kotick badly wanted fresh air before he was out of the dark tunnel they led him through.
“My wig！”he said，when he rose，gasping and puffing，into open water at the farther end.“It was a long dive，but it was worth it.”
The sea cows had separated and were browsing lazily along the edges of the finest beaches that Kotick had ever seen.There were long stretches of smooth-worn rock running for miles，exactly fitted to make seal-nurseries，and there were play-grounds of hard sand sloping inland behind them，and there were rollers for seals to dance in，and long grass to roll in，and sand dunes to climb up and down，and，best of all，Kotick knew by the feel of the water，which never deceives a true sea catch，that no men had ever come there.
The first thing he did was to assure himself that the fishing was good，and then he swam along the beaches and counted up the delightful low sandy islands half hidden in the beautiful rolling fog.Away to the northward，out to sea，ran a line of bars and shoals and rocks that would never let a ship come within six miles of the beach，and between the islands and the mainland was a stretch of deep water that ran up to the perpendicular cliffs，and somewhere below the cliffs was the mouth of the tunnel.