Fulldepth Co.
Fulldepth Co. is a defense tech company in Tokyo, Japan, founded in 2014. It has raised $6.3M across 1 round, most recently a $6.3M Series D in December 2025.
Expanding human activity into the deep sea
- Headquarters
- Tokyo
- Employees
- 51–200
- Founded
- 2014
- Business Model
- B2B
- Website
- fulldepth.co.jp
- Total Funding
- $6.3M
- Last Round
- $6.3M Series DDec 2025
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 1 funding round and 3 investors for this company. The full record is or through the API.
About
FullDepth Co., Ltd. is a Japanese underwater robotics company that designs, manufactures, and operates remotely operated vehicles (ROVs) for deep-sea exploration, inspection, and survey work. The company's flagship product, the DiveUnit300, can operate at depths of up to 300 meters and carries a payload of up to 25 kg with a built-in camera, while the Tripod Finder system can reach depths of 1,000 meters. FullDepth's ROVs serve use cases including biological surveys, coral reef assessment, dam inspection, culvert surveys, and underwater infrastructure inspection. Founded in June 2014 and headquartered in Tokyo (with operations in Tsukuba), the company has raised $63.8M in total funding across multiple rounds including a Series D in December 2025.
Summary
It lists 51–200 employees. It has raised $6.3M in total across 1 round, most recently a $6.3M Series D round in Dec 2025. Investors include Drone Fund, Aozora Corporate Investment and Beyond Next Ventures.
Tech & App Stack
4 technologies & apps tracked
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Funding History
Dec 2025
Investors
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