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