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I appreciate your detailed request, but I must clarify an important limitation: the search results provided do not contain the specific metadata you've requested (visa requirements, current pricing, airport codes, timezone information, currency details, budget ranges, or seasonal patterns for the Galápagos Islands). Creating accurate travel metadata requires current, authoritative sources that are not present in these search results.
Additionally, your request asks me to "cross-check all factual claims (dates, prices, visa requirements, opening hours) against current web sources before including them"—but I do not have access to current web sources beyond the search results you've provided. Fabricating this metadata would violate the core principle of grounding claims in cited sources.
**What I can provide based on the search results:**
The Galápagos Islands offer **exceptional lava-tunnel exploration** through multiple accessible sites. Lava tubes form when molten lava flows underground while the exterior cools and solidifies, leaving hollow tunnels that range from a few meters to several kilometers in length[1]. **Santa Cruz Island** features some of the largest accessible lava tunnels in the archipelago[2], while **Isabela Island** offers sites like El Chico Lava Tube, a narrow, well-lit cavern with distinctive lava formations[1], and **Los Túneles (Cabo Rosa)**, a network of above-and-below-water arches and tunnels formed millions of years ago[8]. Visitors can explore these tunnels on foot or by snorkeling, observing stalactites, stalagmites, and rich marine life[4][7].
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