 Springs rise 6.1 to 7.3 m (20 to 24 ft), while neaps rise 4.2 m (13.8 ft).Tidal currents can reach four or five knots and create a large whirlpool between Cape Tyl'sky and Medvezhy Island.Between 1852 and 1905, American and Russian whaleships cruised for bowhead whales in the gulf.