--- 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 duration_minutes: 360 duration_max_minutes: 480 languages: [pt, en, es] free_cancellation: "true" rank_in_category: 3 of 25 (Private Tours) schedule_checked: 2026-09-30 data_updated: 2026-11-03 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. In our comparison: #3 of 25 in Private Tours, by rating weighted by review volume (table below). ## 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 - Min. 2 to book: not for solo travellers - Starts 09:00: one departure a day - Food not included: bring or buy your own - Strollers OK: infants accepted - Children from €180: ages 12 to 17 **Pickup:** Hotel pickup from 14 pickup points ## Key facts - Price: from €180 per person - Duration: 6h–8h - Rating: 5.0/5 from 55 reviews (collected from Guidekin & Viator & Tripadvisor) - Free cancellation (see policy below) - Operator: Azores Expeditions - Minimum booking: 2 travellers at this price - Group: Private tour, your party only - Guide languages: Portuguese, English, Spanish - Start times: 09:00 - Booking: Confirmation within 48 hours, mobile ticket - Price checked on Viator: 2026-09-30 ## Reviews 5.0 from 55 ratings on Guidekin, Viator & Tripadvisor. 100% of ratings with a star breakdown are 4 or 5 stars: 55 of 55. - 5 stars: 55 (100%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 star: 0 (0%) ### What reviewers say Reviewers praise the cave expertise, personal attention and photography help; some underground passages are narrow **Praised:** - Detailed explanations of cave geology and the island's history - Visits to private caves that are not open to the general public - Photography tips and help capturing photos inside the caves - Flexible itineraries adapted to travellers' interests - Patient guidance and a steady focus on safety underground **Complaints:** - No recurring complaints; reviewers note narrow cave passages Written by Guidekin from the 46 most recent English reviews on Viator & Tripadvisor (2018-12-04 to 2026-08-01); last checked 2026-10-07. ## 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: 2026-09-30 - 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 Booking asks for: dates of birth, passport details, arrival flight or ship details ## Compared with other Private Tours | Tour | Price | Duration | Rating | Group | |---|---|---|---|---| | **This tour · #3 of 25** | €180 | 6h–8h | 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 | 6h | 5.0 (107) | private | | [Sete Cidades and Pineapple Plantation Half Day Private Tour](/portugal/azores/tours/sete-cidades-and-pineapple-plantation-half-day-private-tour-484292P4/?format=md) | €160 per group | 3h | 5.0 (50) | private | Ranked #3 of 25 in Private Tours by Guidekin score (rating weighted by review volume). Prices here run from €70 to €300, median €150; typical length 6h. 25 of 25 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/ Filters, the full catalogue and the URL contract for this city: https://guidekin.com/portugal/azores/?format=md