EVERGLADES NATIONAL PARK, Fla. » Wildlife officials say as many as 20 pilot whales in danger of stranding in Everglades National Park are swimming into deeper water.

Blair Mase of the National Oceanic and Atmospheric Administration said today that a Coast Guard helicopter spotted the two pods of whales swimming several miles north of their previous location. The whales were in about 12 feet of water.

Mase tells reporters that wildlife workers plan to try using noise such as banging on pipes and revving boat engines to herd the whales out to the open ocean Thursday.

At least 10 whales have died since the mass stranding was discovered Tuesday. There were 41 alive at dusk Wednesday.