Optical methodology, instrumentation, and photonics devices for imaging, vision, and optical sensing are increasingly important to understanding our marine environment. Subsea optics can make an important contribution to protecting and sustainably managing ocean resources and monitoring the response of marine systems to climate change. This important book offers an authoritative review of key principles, technologies, and applications. The book is divided into three parts. The first part introduces key concepts in subsea optics and imaging, imaging technologies and the development of ocean optics, and color analysis. Part two reviews the use of subsea optics in environmental analysis. Part three reviews subsea optical systems technologies. An overview of imaging and visualization using conventional photography and video segues to advanced techniques like digital holography and laser line-scanning as well as their use in controlled observation platforms or global observation networks. This section also outlines techniques such as Raman spectroscopy, hyperspectral sensing and imaging, laser Doppler anemometry (LDA) and particle image velocimetry (PIV). The book ends with a chapter on fluorescence methodologies. With its distinguished editor and international team of contributors, Subsea Optics and Imaging is a standard reference for those researching, developing and using subsea optical technologies as well as environmental scientists and agencies that monitor the marine environment.