South Korea's Navy has for the first time tested a humanoid robot capable of replacing a sailor at a ship's wheel, as the service confronts a shrinking pool of draft-age recruits driven by the country's declining birth rate. South Korea reported a total fertility rate of approximately 0.72 in 2023 — the lowest in the world — and every able-bodied South Korean man is currently required to complete roughly 18 to 21 months of military service, making the demographic decline a direct constraint on force levels across all branches.

The humanoid, named PIBOT, was developed by a research team at the Korea Advanced Institute of Science and Technology (KAIST). Development began in 2022 under a program managed by the Agency for Defense Development, with South Korea's arms procurement agency investing approximately 5.7 billion won ($3.8 million to $4.1 million) to date.

Trial at the Naval Education and Training Command

The test was conducted at the Naval Education and Training Command's ship handling facility in Changwon, located in South Gyeongsang Province roughly 300 kilometers southeast of Seoul. The Navy announced the trial on Friday.

During the demonstration, an officer aboard a simulated Aegis destroyer issued the command: "Port five degrees, hold course 330." PIBOT repeated the order back, grabbed the wheel, and confirmed: "Holding course 330."

PIBOT uses a large language model to process verbal commands and repeats each instruction before executing it — a standard readback procedure that mirrors how a human helmsman confirms an order and helps catch miscommunication before it occurs. The robot navigated narrow channels, adverse weather conditions, and nighttime scenarios, where errors at the helm carry the greatest consequences.

Cmdr. Kim Hyeong-jun, who leads the Navy's Force Analysis and Test Evaluation Group, described the demonstration as "an initial step toward analyzing whether a robot can execute ship handling … without any error."

Professor Shim Hyun-chul, the KAIST lead researcher, called it "deeply meaningful to be able to test the feasibility of a physical AI-based humanoid robot executing actual helmsman duties aboard a naval vessel."

Four-Stage Roadmap Toward Active Warships

Officials outlined a four-step roadmap for the program. Land-based simulators form the first phase, followed by trials on moored ships. The plan culminates in day and night sea trials aboard active warships.

The initiative falls under Sea GHOST, the Navy's broader framework for building a hybrid fleet that integrates human personnel with robotic systems. The service has repeatedly emphasized workload reduction as a primary objective, with the expectation that routine bridge duties will gradually be transferred to robotic crew members. South Korea is not alone in pursuing unmanned and automated naval systems — the United States Navy has launched similar initiatives under its own hybrid-fleet strategy, and China has expanded unmanned surface vessel programs in parallel — but the PIBOT program is notable for its focus on a humanoid form factor designed to operate within existing ship consoles rather than requiring purpose-built robotic infrastructure.

Kim stated that the Navy intends to adapt to a defense environment shaped by declining troop numbers and rapid technological change. The results of these trials will inform decisions about which additional shipboard roles may be assigned to robots.

Broader Investment in Humanoid and Automation Technology

Separately, Blackstone has agreed to invest in South Korean high-precision actuator manufacturer Futronic, valuing the company at approximately $676 million. Actuators — components that convert control signals into physical motion — are the same technology that enables a robotic hand to grip and turn a ship's wheel.

Blackstone principal Kyungmin Song described the convergence of AI and the physical world as a "key investment theme" for the firm's private equity arm. "Humanoids and broader automation are still in the early innings of exponential growth," he said.