1Inference of Sound Attenuation in Marine Sediments from Modal Dispersion in Shallow Water 2Counterintuitive Results in Underwater Acoustic Communications 3Comparisons of Methods for Numerical Internal Wave Simulation in Long Range Acoustical Propagation 4Acoustic Data Assimilation: Concepts and Examples 5The Preliminary Results of a Single-Hydrophone Geoacoustic Inversion for Data Collected at the Sea of Japan 6Measurements of Ultrasound Attenuation of Suspended Particles with Various Size Distributions 7A Low Complexity Multichannel Adaptive Turbo Equalizer for a Large Delay Spread Sparse Underwater Acoustic Channel 8A Turbo Equalization Based on a Sparse Doubly Spread Acoustic Channels Estimation 9Design and Testing of Underwater Acoustic Communications for an AUV 10Research of Axis Mismatches Between Pairs of Sensitive Elements of Underwater Acoustic Velocity Gradient Sensors 11 A Passive Fathometer Technique for Bottom Profiling Using Ambient Noise 12Target Motion Parameter Estimation for LOFARgrams Based on Waveguide Invariants 13Source Localization by Maximizing the Longitudinal Correlation Using Waveguide Invariant Theory 14Selective Detection and Localization by Decomposition of a Subrank Time Reversal Operator 15Sounds of Undersea Gas Leaks 16Multi-AUV Localization for an Underwater Acoustic Sensor Network