Acoustic signatures have been acquired from a pod of Beluga (Delphinapt-Erus Leucas) whales. These whales were swimming unmolested on the surface in the lead ∼1000×200 yd in the north Bering Sea. The acoustic data were acquired with a sensitive noise system ( — 84 dB) in a region free of man-made noise. The acquired broad-band data were recorded on a magnetic tape recorder for analysis in the laboratory. Analysis of the data shows the whales to have a complex sonar which possesses both directivity and a wide range of generation modes. Analysis of the squeels, bleats, and chirps would suggest that each has a distinct purpose in the overall communication system. I find some acoustic signals are tonal where others are seen to sweep across the spectrum. The analysis presents typical acoustic emissions source level with respect to frequency in the time domain.