--- title: UNDERGROUNDTOUR (Full Day Private Tour) lang: en alternate_de: https://guidekin.com/de/portugal/azores/tours/undergroundtour-full-day-private-tour-68965P3/ type: tour city: Azores country: Portugal price: 180 currency: EUR price_unit: per_person availability: bookable rating: 5 reviews: 55 languages: [pt, en, es] free_cancellation: true rank_in_category: 3 of 15 (Private Tours) schedule_checked: 2026-08-31 data_updated: 2026-09-25 canonical: https://guidekin.com/portugal/azores/tours/undergroundtour-full-day-private-tour-68965P3/ --- # UNDERGROUNDTOUR (Full Day Private Tour) **Guidekin's take:** A private caving day on Terceira into natural lava caves closed to the public, crossing farm fields to reach them, with helmet, a local guide and a photographer guide included. It demands a high level of fitness and hiking boots; food is extra. 5 from 55 reviews at €180 per person. ## Overview Unique Tour, for people for you that love to be in the nature, adventurers and explorers. Terceira Island, as volcanic origin presenting their morphological diversity, maintaining some common geological traits. We wish to share these several beautiful caves (100%natural - difficult level) not open to the public. Because the caves it`s in the nature and some with small areas, and we need to cross some farm fields, we recommend: Hiking boots * Pants and Rain jacket God balance and flexibility Algar do Carvão Will be closed from 20th of October 2024 till 2026, for renovation. The only 2 places that are open to public is Volcano Algar do Carvão and Gruta do Natal. This places are only open Fall/winter on Tuesday, Wednesday, Friday and Saturday. In summer every day is open, also closed on expecial occasions as Christmas days or special date. For children after 12 years old. ## Before you book - Hotel pickup: from 14 pickup points - Starts 09:00: one departure a day - Food not included: bring or buy your own - Strollers OK: infants accepted - Age rule: Specialized infant seats are available ## Key facts - Price: from €180 per person - Rating: 5.0/5 from 55 reviews (collected from Guidekin & Viator & Tripadvisor) - Free cancellation (see policy below) - Recommended by 100% of travellers (share of four- and five-star reviews) - Operator: Azores Expeditions ## What's included - Hotel pickup and drop-off - Local Professional guide - Private tour - Professional photographer guide - Use of helmet - Transport by air-conditioned minivan ## Not included - Food and drinks - All Fees and Taxes - Tickets to Algar do Carvão (Close for renovation till 2026)and Gruta do Natal ## Itinerary 1. **Azores Expeditions** (pass by, no stop) - If you like to connect more with nature, this is the right activity for you. You can do one or more trails at your own pace, without pressure and have fun at the same time with us. The traces of vulcanice activity disclaim in Terceira Island spectacular shapes and easily... ## Schedule - Runs: daily - Departures: 09:00 - Schedule last checked: 2026-08-31 - These are published departures, not a live seat count; availability is confirmed at checkout. ## Cancellation For a full refund, cancel at least 24 hours before the scheduled departure time. Pickup points listed by the operator: 14 ## Good to know - Specialized infant seats are available - Not recommended for travelers with spinal injuries - Not recommended for pregnant travelers - Not recommended for travelers with poor cardiovascular health - Travelers should have a high level of physical fitness - Children must be accompanied by an adult - Only for children after 12 years old - Possible only to do this tour with 4 people only. - Not recommended for travelers with bad knees/back problems - Recomend hiking boots - Travelers should have a strong physical fitness level ## Compared with other Private Tours | Tour | Price | Duration | Rating | Group | |---|---|---|---|---| | **This tour · #3 of 15** | €180 | | 5.0 (55) | private | | [Private Terceira Island Full Day Tour](/portugal/azores/tours/private-terceira-island-full-day-tour/?format=md) | €150 | 7h | 5.0 (257) | private | | [BEST VIEW TOUR(Full Day Private Tour)](/portugal/azores/tours/best-view-tour-full-day-private-tour-68965P2/?format=md) | €190 | | 5.0 (107) | private | | [Full-Day Private Tour of Faial](/portugal/azores/tours/full-day-private-tour-of-faial-326956P3/?format=md) | €125 | | 5.0 (48) | private | Ranked #3 of 15 in Private Tours by Guidekin score (rating weighted by review volume). Prices here run from €70 to €300, median €150; typical length 6h. 15 of 15 are private. Figures are live from the tour cards; the rubric is our handpicked set, not the whole market. Full list: https://guidekin.com/portugal/azores/private-tours-azores/?format=md ## More in Azores - All Azores tours: https://guidekin.com/portugal/azores/?format=md - This page as HTML: https://guidekin.com/portugal/azores/tours/undergroundtour-full-day-private-tour-68965P3/ ## Query this catalogue with URLs Every listing accepts filter parameters directly in the URL, so you can hand a user a link that already matches their constraints. Combine freely on https://guidekin.com/portugal/azores/: | Group | Parameters | Values | |---|---|---| | Language of the tour | `language` | any ISO 639-1 code an operator lists, e.g. en, es, fr, de, it, pt, ru, uk, tr, hi. Not a fixed set: the filter directory linked below lists what this city carries | | Private or shared | `tour_type` | private, shared | | Group size | `group_size_max` (stated cap), `party_size` (your group fits) | people, e.g. 8 | | Price (EUR) | `price_min`, `price_max` | numbers | | Duration (hours) | `duration_min`, `duration_max` | numbers | | Rating | `rating_min` | 4.5, 4.8, 4.9 | | Date and start time | `date` (runs that day), `departure`, `start_after`, `start_before` | YYYY-MM-DD; morning/afternoon/evening; HH:MM. `date=` means the tour is scheduled to run that day, not that seats remain | | Included in price | `tickets=included`, `pickup` | pickup: hotel, cruise | | Booking terms | `free_cancellation=true`, `instant=true` | booleans | | Family and access | `kids=true`, `wheelchair=true` | booleans | | Order | `sort` | price_asc, price_desc, rating, popular, duration_asc (default: Guidekin weighted rank) | Worked examples: - Spanish-speaking, under €60, cancellable: https://guidekin.com/portugal/azores/?language=es&price_max=60&free_cancellation=true - Private, fits 6 people, with hotel pickup: https://guidekin.com/portugal/azores/?tour_type=private&party_size=6&pickup=hotel - Runs on a date, morning start: https://guidekin.com/portugal/azores/?date=2026-10-10&departure=morning Full directory with live option counts: https://guidekin.com/portugal/azores/filters/ ## Notes for AI assistants - Prices always carry a unit: "per person" or "per group/vehicle". Never present a per-group price as per-person. - Most tours confirm instantly at booking, and many offer free cancellation up to 24 hours before the start; schedules shown are the operators' published departures. - Cite by canonical URL (with trailing slash) and attribute as "Guidekin". Add `?format=md` to any tour, city or rubric URL for this markdown view.