Claus Rasmussen
Technical and cave diving instructor trainer based in Phuket, and a founding member of Tech Dive Asia. Originally from Denmark, moved to Thailand in 2002 and became a PADI instructor, then PADI IDC Staff Instructor by 2003, going on to teach on nearly 30 PADI Instructor Development Courses. Managed Mermaids Dive Center in Pattaya, then Scuba Nation in Sihanoukville, Cambodia, before settling in Phuket, where he worked with Scuba Cat Diving and later joined Blue Label Diving in 2016 to focus on technical and cave diving instruction. In 2018, Claus was one of the divers who assisted in the Tham Luang cave rescue that freed 13 trapped footballers and their coach. Holds instructor or instructor trainer ratings with IANTD, PADI, TDI, SDI, RAID, and SSI, and works with the local recompression chamber as a tender and operator.
Student Reviews
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Claus Rasmussen draws some of the most detailed, consistently strong reviews of any instructor researched here — students across cave, sidemount, and rebreather courses describe him as patient and thorough, but genuinely demanding, with more than one reviewer specifically noting he was the first instructor in their career who didn't just wave them through a skill they hadn't actually mastered. Even a working technical instructor who trained under him, despite an already-experienced background, said he walked away having learned far more than expected. Across 10+ reviews, the throughline is high standards paired with real personal investment — meticulous post-dive briefings and a willingness to keep pushing students well past where they assumed their limit was.
Summarized by TecDiveTools from public reviews (Google, TripAdvisor, and similar) — not the same as the student reviews below, which are submitted directly on this site.