Deep-diving manned submersibles, such as Alvin, which gained worldwide fame when researchers used it to reach the wreck of the Titanic, have helped advance deep-ocean science. But many scholars in this field have noted that the number and capabilities of today's underwater vehicles no longer meet current scientific demands. At the same time, the relative value of manned and unmanned vehicles is often disputed. The report finds that new submersibles-both manned and unmanned-that are more capable than those in the current fleet are needed and would be of great value to the advancement of ocean research.

The United States faces decisions requiring information about the oceans in vastly expanded scales of time and space and from oceanic sectors not accessible with the suite of tools now used by scientists and engineers. Advances in guidance and control, communications, sensors, and other technologies for undersea vehicles can provide an opportunity to understand the oceans' influence on the energy and chemical balance that sustains humankind and to manage and deliver resources from and beneath the sea. This book assesses the state of undersea vehicle technology and opportunities for vehicle applications in science and industry. It provides guidance about vehicle subsystem development priorities and describes how national research can be focused most effectively.

Despite our reliance on the ocean and its resources, it remains a frontier for scientific exploration and discovery. Seafloor observatoriesâ€"unmanned systems of instruments, sensors, and command modulesâ€"will have power and communication capabilities to provide support for spatially distributed sensing systems and mobile platforms. Illuminating the Hidden Planet is a voyage to the bottom of the sea, advancing oceanographic science further through long time-series measurements, to discover the mysteries of the deep that have, until now, avoided scientific opportunity.

This volume is one of the most significant results of the conference Science-Technology Synergy for Research in Marine Environment: Challenges for the XXI Century held in Erice and Ustica, Italy, September 1999. It presents state of the art developments in technology and scientific research in sea floor observatories. Scientific conclusions of earth science and environmental studies obtained from these observatories as well as results from long term monitoring are provided. Descriptions of new technologies enabling deep sea long term observatories are offered and marine environment and risk assessment issues are discussed.This is the first work detailing recent and on going experiments world wide specifically devoted to deep sea multi disciplinary observation systems, the technology enabling sea floor observatories, and the presentation of first results from these systems.