[12][13][14] In 1568, Spanish explorer and cartographer Álvaro de Mendaña became the first European known to sail through the archipelago, sighting the island of Nui during an expedition he was making in search of Terra Australis.Licensing fishing permits to international companies, grants and aid projects, and remittances to their families from Tuvaluan seafarers who work on cargo ships are important parts of the economy.[28][29] Keith S. Chambers and Doug Munro (1980) identified Niutao as the island that Mourelle also sailed past on 5 May 1781, thus solving what Europeans had called The Mystery of Gran Cocal.In 1809, Captain Patterson in the brig Elizabeth sighted Nanumea while passing through the northern Tuvalu waters on a trading voyage from Port Jackson, Sydney, Australia to China.[28] In May 1819, Arent Schuyler de Peyster, of New York, captain of the armed brigantine or privateer Rebecca, sailing under British colours,[31][32] passed through the southern Tuvaluan waters.[44] After the high point in the 1880s,[44] the numbers of palagi traders in Tuvalu declined; the last of them were Fred Whibley on Niutao, Alfred Restieaux on Nukufetau,[55][56] and Martin Kleis on Nui.[78] Harry Clifford Fassett, captain's clerk and photographer, recorded people, communities and scenes at Funafuti in 1900 during a visit of USFC Albatross when the United States Fish Commission was investigating the formation of coral reefs on Pacific atolls.[101] On 15 November 2022, amidst sea level rises, Tuvalu announced plans as the first country in the world to build a self-digital replica in the metaverse in order to preserve its cultural heritage.[104][105] Tuvalu is a volcanic archipelago, and consists of three reef islands (Nanumanga, Niutao and Niulakita) and six true atolls (Funafuti, Nanumea, Nui, Nukufetau, Nukulaelae and Vaitupu).The highest elevation is 4.6 metres (15 ft) above sea level on Niulakita; however the low-lying atolls and reef islands of Tuvalu are susceptible to seawater flooding during cyclones and storms.A 2018 report stated that the rising sea levels are identified as creating an increased transfer of wave energy across reef surfaces, which shifts sand, resulting in accretion to island shorelines.[110] Surveys were carried out in May 2010 of the reef habitats of Nanumea, Nukulaelae and Funafuti; a total of 317 fish species were recorded during this Tuvalu Marine Life study.[121] During World War II, several piers were also constructed on Fongafale in the Funafuti Lagoon; beach areas were filled and deep-water access channels were excavated.[129] The project of the Japan International Cooperation Agency is designed to increase the resilience of the Tuvalu coast against sea level rise, through ecosystem rehabilitation and regeneration and through support for sand production.[138] Westerly gales and heavy rain are the predominant weather conditions from November to April, the period that is known as Tau-o-lalo, with tropical temperatures moderated by easterly winds from May to October.[153] The 2011 report of the Pacific Climate Change Science Program published by the Australian Government,[154] concludes: "The sea-level rise near Tuvalu measured by satellite altimeters since 1993 is about 5 mm (0.2 in) per year.[118][119][157][158][159] In November 2022, Simon Kofe, Minister for Justice, Communication & Foreign Affairs, proclaimed that in response to rising sea levels and the perceived failures by the outside world to combat global warming, the country would be uploading a virtual version of itself to the metaverse in an effort to preserve its history and culture.Further projects that are part of TCAP are capital works on the outer islands of Nanumea and Nanumaga aimed at reducing exposure to coastal damage resulting from storms.In March 2015, the winds and storm surge created by Cyclone Pam resulted in waves of 3 to 5 metres (9.8 to 16.4 ft) breaking over the reef of the outer islands, causing damage to houses, crops and infrastructure.[182][183] The Tuvalu Government carried out assessments of the damage caused by Cyclone Pam to the islands and has provided medical aid, food as well as assistance for the cleaning-up of storm debris.[226] In 2016, the Minister of Natural Resources drew attention to Article 30 of the WCPF Convention, which describes the collective obligation of members to consider the disproportionate burden that management measures might place on small-island developing states.[246] The threat of global warming in Tuvalu is not yet a dominant motivation for migration as Tuvaluans appear to prefer to continue living on the islands for reasons of lifestyle, culture and identity.In 2014, attention was drawn to an appeal to the New Zealand Immigration and Protection Tribunal against the deportation of a Tuvaluan family on the basis that they were "climate change refugees", who would suffer hardship resulting from the environmental degradation of Tuvalu.[301][302][303] Another traditional food source is seabirds (taketake or black noddy and akiaki or white tern), with pork being eaten mostly at fateles (or parties with dancing to celebrate events).[306][307] Paopao (from the Samoan language, meaning a small fishing-canoe made from a single log), is the traditional single-outrigger canoe of Tuvalu, of which the largest could carry four to six adults.The 2014 Country Report describes economic growth prospects as generally positive as the result of large revenues from fishing licences, together with substantial foreign aid.[333] Government revenues largely come from sales of fishing licences, income from the Tuvalu Trust Fund, and from the lease of its ".tv" internet Top Level Domain (TLD).[340] Tuvalu participates in the Enhanced Integrated Framework for Trade-Related Technical Assistance to Least Developed Countries (EIF), which was established in October 1997 under the auspices of the World Trade Organisation.[346] The agreement provided a combined data transfer capacity of 400 to 600 Mbit/s to schools, medical clinics, government agencies, small businesses, and 40 outdoor Wi-Fi hotspots, as well as Tuvaluan interisland ferries via three maritime antennae.The vessels are used for fisheries research, deploying fish aggregating devices (FADs), visiting outer islands for monitoring and consultations, including to implement Tuvalu's National Adaptation Programme of Action (NAPA) to address climate change.