Seatrec Partners with Naval Postgraduate School to Study Ocean Soundscape

Seatrec and Naval Postgraduate School Launch a New Project to Study Ocean Soundscape and Chart Impact of Noise Pollution on Ocean Environment

Hydrophone-equipped autonomous float powered by the ocean’s temperature differences will listen for clues to help minimize the impact of human noise

VISTA, Calif., November 14, 2022 -  Seatrec and the Naval Postgraduate School (NPS) today launched a new project to study the impact of human-made noise on the ocean soundscape and marine life. An Ocean Sonics hydrophone installed on a Seatrec autonomous sustainably powered float system is the first of its kind and enables acoustic data to be collected anywhere in the world’s oceans nearly indefinitely.

“When it comes to understanding the ocean, sound is everything, but persistent listening is extremely difficult and expensive,” explains Yi Chao, Ph.D., Seatrec’s CEO and Founder. “The Naval Postgraduate School is a great partner, and we are excited to help them research acoustic impacts more effectively and affordably. Providing the necessary scientific instruments that are powered by the ocean’s own temperature differences opens the door to persistent monitoring of our oceans in an economical manner.”

Studies show that noise from humans adversely affects a broad range of organisms including whales, fish, jellyfish, squid and octopuses. High noise levels even contribute to deformities among scallop larvae. However, the true extent of impacts from noise pollution is not well understood.

The emergence of the COVID-19 pandemic in 2020 brought with it unprecedented silence as human activities related to commerce and recreation all but ceased. That reduction in human activity gave scientists a new baseline for ocean noise and highlighted the impact that human noise pollution has on life in the ocean.

“Sound is the way the Navy and many marine animals ‘see’ through the ocean,” says John Joseph, the principal investigator and faculty associate for research at the Naval Postgraduate School. “It’s critical that we understand the reach and scale of the collective human impact on the ocean soundscape to inform strategies for protecting marine species and improving naval operations for the defense of our ships and Sailors at sea.”

The COVID-related silence also offered a powerful argument for broadening the deployment of hydrophones to monitor ocean noise and to include hydrophones on autonomous platforms to provide real-time acoustic data for the dynamic management of vulnerable areas. Underwater gliders have been used in this role and are also used by the Navy for passive surveillance, but they are powered by batteries with a limited lifetime and are usually confined to near the coast.

Traditional hydrophones are positioned at depths around 1,000 meters (3,300 feet), within the SOFAR (SOund Fixing And Ranging) channel, where the sound speed is minimum. Sound is trapped within this SOFAR channel by refraction and can travel slowly over great distances. Hydrophones can be lowered into the SOFAR channel from a ship, which is expensive to operate – often starting at $50,000 per day. They can also be placed on the seafloor and powered by fiber optic cables connected to a shore station on land, but there are only a handful of places with this infrastructure.

“Our hydrophone float powered by Seatrec’s patented energy harvesting system can be deployed into the SOFAR channel anywhere over the world’s ocean,” said Yi. “It offers nearly unlimited persistent surveillance of the ocean without the need for ship support as the float battery is recharged by the temperature differences in the ocean.”

Naval forces have an inherent operational reason to be quiet at sea, and the research into ocean noise may provide additional insight for the Navy and Marine Corps in planning for future underway operations.

“Passive acoustic listening has many operational and research applications in the Navy, and our students at NPS conduct applied research to meet naval-unique needs for at-sea operations that require measurements of ambient noise, understanding soundscapes and monitoring of marine mammals,” added Joseph. “Because the Seatrec platform will be long-lived, and is remotely operated, it can provide extensive time series of information to oceanographers and naval researchers to measure acoustics and how they are changing from human impact including climate change.”

This research effort is supported by the Consortium for Robotics and Unmanned Systems Education and Research (CRUSER) at NPS, which is funded by the Office of Naval Research to provide a collaborative environment for the advancement of educational and research endeavors across the Navy and Marine Corps.

This project comes on the heels of Seatrec’s recent launch of Project NEMO – an initiative in partnership with The Nippon Foundation-GEBCO Seabed 2030 Project to install an active acoustic echosounder to Seatrec’s thermally powered float.

About Seatrec
Seatrec designs and manufactures energy harvesting systems that generate electricity from naturally occurring temperature differences in ocean waters. This renewable energy can be used to power deep water oceanographic research equipment such as autonomous profiling floats, resulting in the most scalable, cost-effective deep ocean data collection possible. The company is headquartered in Vista, CA. Visit us at and @seatrecinc.

About the Naval Postgraduate School
The Naval Postgraduate School is a defense-focused graduate university offering master’s and doctoral degrees in fields of study core to Naval-unique needs, the U.S. Armed Forces, DOD civilians and international partners. For information, visit:

Media Contact
Sean Yokomizo
+1 925.878.1200


Click here to read the full press release.

Seatrec Launches Project FIND


Seatrec Launches Project FIND to Provide Underrepresented Oceanographers with World-Class, Sustainable Technology to Help Save the Ocean

Five teams of oceanographers from underrepresented communities will each receive a $75,000 Navis scientific float with SL1 energy harvesting modules + free machine learning from to boost their research

VISTA, Calif. (Sept. 23, 2021) – Seatrec, a renewable energy company that harvests energy from temperature differences in the environment, today launches Project FIND – Float Innovation & New Discovery – to promote equity in ocean research by providing underrepresented oceanographers with world-class, sustainable technology.

“The ocean is in crisis and we cannot afford to have the world’s best and brightest on the sidelines because they lack access to data and technology,” insists Yi Chao, Seatrec’s Founder and CEO. “We must commit to building scientific capacity and infrastructure in every continent because every coastline has a stake in the ocean’s future.”

The program is also sponsored by visionary data science and AI cloud platform provider,, providing five teams of oceanographers from underrepresented communities each with free access to machine-learning tools to process data from a Navis-SL1 scientific float powered by SL1 energy harvesting modules (a $75,000 value). The oceanographers were selected based on their contributions to the global understanding and preservation of the ocean.

“Ocean science is data science,” said Sri Ambati, CEO and founder of “Democratizing ocean science by providing underrepresented communities with access to world-class research tools is a critical step to preserving our oceans, and ultimately unlocking the mysteries of all life. We are honored to support this important work and provide’s AI cloud platform for its prime purpose – AI for good.”

The oceanographers selected for Project FIND are:

Asha De Vos, a Sri Lankan scientist and National Geographic Explorer best known for her studies of blue whales.

Joseph K. Ansong, a senior math lecturer at the University of Ghana who specializes in understanding the energetics of regional/global oceanic processes.

Miguel Tenreiro, a researcher based in Mexico studying the Gulf of Mexico circulation and its impact on weather and hurricanes.

Olga Sato and Paulo Polito, lead a team from Brazil studying the South Atlantic Meridional Overturning Circulation as an indicator for changes in climate.

Tamaryn Morris and Juliet Hermes, lead a South African team focused on the Mozambique Channel and the Agulhas Current.

Seatrec’s energy harvesting system uses solid-to-liquid (SL) phase change materials to convert temperature differences into electricity in order to power profiling floats.

The Navis Autonomous Profiling Float, built by Sea-Bird Scientific, is widely used – including by Argo, the international ocean-monitoring network – for taking scientific measurements such as temperature and salinity down to 1,000 meters. The selected FIND investigators will receive a Navis float integrated with two of Seatrec’s SL1 modules that power the float using clean, renewable energy harvested from the ocean’s temperature differences.

Investigators will also have free support and access to’s award-winning Driverless AI platform that uses AI to deliver expert data science easier, faster, and cheaper than traditional applications.

Project FIND seeks to demonstrate the potential of SL energy harvesting to enable discovery, introduce a renewable paradigm for float operations, and provide state-of-the-art oceanographic instruments to underrepresented oceanographers.

About Seatrec
Seatrec designs and manufactures energy harvesting systems that generate electricity from naturally occurring temperature differences in ocean waters. This renewable energy can be used to power deep water oceanographic research equipment such as floats, gliders, and Autonomous Underwater Vehicles (AUVs), resulting in the most scalable, cost-effective deep ocean data collection possible. Incorporated in 2016 by CEO, Dr. Yi Chao, Seatrec’s technology originated at NASA Jet Propulsion Laboratory, California Institute of Technology, to provide clean power for remote off-grid locations. The company is headquartered in Vista, CA. Visit us at and @seatrecinc.

Media contact
Sean Yokomizo
+1 925.878.1200


World Economic Forum Highlights Seatrec in Video

The World Economic Forum published a video that features Seatrec and explores the potential of our thermal-powered floats to help us better understand and utilize our oceans.

The oceans make up two-thirds of our planet and underpin our food and sustenance, medicine and vaccines, transport and commerce, and the global climate. And yet, as the video shows, our oceans are poorly understood; we currently have a clearer picture of Mars than we do of the seafloor.

What stands between our ability to measure, understand, and protect our oceans is energy – and Seatrec’s technology can generate infinite, renewable power from the ocean itself.

Through Seatrec’s ocean-based sustainable energy, we can monitor the climate, improve hurricane forecasts, optimize shipping routes, and so much more. Seatrec is currently working with oceanographers, government entities, and private companies across the blue tech ecosystem to map the ocean, conserve marine ecosystems, and unlock the potential of the blue economy.

Watch the full video here.