The Sea Machines SELKIE is a high-performance autonomous surface vessel engineered for offshore and coastal missions. Powered by the SM300 autonomy system, it delivers reliable, independent navigation with robust fallback controls in low-communication environments. SELKIE achieves a top speed of 30 knots, a cruise speed of 25 knots, and operates up to 500 nautical miles. Its modular cargo bay supports 300 kg payloads, while a through-hull sonar tube enhances survey precision. With multiple connectivity options including LTE, Starlink, and Iridium, it ensures global mission reach. Designed for ISR, surveillance, and research, SELKIE offers dynamic stability and unmatched marine autonomy performance.