Marine / Underwater Robot Leaderboard

2 robots · ranked by MARMX

All robots (Unverified) 2 tracked → Every robot we track in this category — including the 0 not ranked on this leaderboard, and why.

#	Robot	Status	Autonomy	DoF	Payload	Speed	Conf.	MARMX
1	🇺🇸 SurveyorSaildrone	commercial	task-autonomous	—	—	3.09 m/s	mediumLegacy baseline · field review incomplete	80.3
2	🇺🇸 VoyagerSaildrone	commercial	task-autonomous	—	—	—	mediumLegacy baseline · field review incomplete	57.9

Best underwater robots in 2026: who leads and why

Surveyor by Saildrone is the highest-scoring underwater robot on the MARMX in 2026, at 80.3 out of 100 — 22.4 points clear of Voyager by Saildrone (57.9).

The leaders share a strength: Surveyor on commercial readiness & deployment (100.0) and Voyager on commercial readiness & deployment (99.0). The MARMX weights mobility & locomotion (30%), autonomy & intelligence (25%) and hardware & engineering (25%) above the rest, so a lead there is worth more than the same lead elsewhere.

Frequently asked questions

What is the best underwater robot in 2026?

On the MARMX, Surveyor by Saildrone scores highest, at 80.3 out of 100. Voyager (57.9) follow. Scores are computed from published specifications and deployments, each with recorded sources; coverage and independent measurement vary by field.

How are underwater robots ranked here?

By the Marine Metric (MARMX), a 0–100 composite of autonomy & intelligence (25%), manipulation & dexterity (8%), mobility & locomotion (30%), hardware & engineering (25%) and commercial readiness & deployment (12%), normalised against reference scales specific to underwater robots. The weights are published and the scores are reproducible from public specifications.

Reading the table. MARMX is the weighted composite (0–100) for this category, normalised against marine / underwater-specific reference scales. “Autonomy” shows the recorded declared mode — teleoperated systems are capped low regardless of hardware. “Conf.” is the data-confidence grade for that robot's specs. Click any row for the full breakdown and sources.

These rankings are not comparable across categories. Each category has its own index, its own pillar weights and its own reference scales, so a score of 71 on the MARMX and a score of 71 on another leaderboard answer different questions. Only autonomy and commercial readiness are scored from ladders that mean the same thing everywhere. Why →