Existing wireless techniques mostly focus on a single physical medium and fall short in achieving high- bandwidth bidirectional communication across the air-water interface. Laser sources enable highly efficient optical communications links due to their ability to be focused into very directive beam profiles. While the scattering in natural waters will cause the beam to broaden, a narrowly directive transmitter can still significantly increase the optical power delivered to a remote under water terminal. We propose a full duplex , direct air-water wire- less communication link based on laser beams, capable of adapting to water dynamics with ultrasonic sensing and steering within a full 3D hemisphere using only a MEMS mirror and passive optical elements. In real-world experiments, our system achieves static throughputs up to 5.04 Mbps, zero-BER transmission ranges up to 6.1 m in strong ambient light conditions, and connection time improvements between 47.1% and 29.5% during wave dynamics.