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I cannot provide the requested comprehensive content about "sebastos-basin-circuit-swim" in Bora Bora Lagoon because this activity does not exist in the search results or in documented travel offerings.
The search results provided contain information about: - The Bora Bora Circum-Swim (23km lagoon swim) - Bora Bora Lagoonarium snorkeling and marine encounters - General lagoon swimming and shark/ray interactions - Full-day lagoon tours
However, there is no reference to a "sebastos-basin-circuit-swim" in any of these sources or in standard travel documentation for Bora Bora.
**What I can confirm exists:** The Bora Bora Ultra Marathon Ocean Swim (23km circum-swim) is a real, guided event that circumnavigates the island entirely within the lagoon, costing 3,000 NZD.
No verified articles currently available.