The original thought was that Galathea 2 was to depart precisely 100 years after Galatea 1, that is, in 1945, but this had to be abandoned because of the Second World War. Already long before the war, young navy officers and scientists had dreamed on venturing out on a Galathea 2 expedition, but the plans only assumed concrete form in 1941 when journalist and author Hakon Mielche entered the scene.
In 1941, Mielche read an article in Ekstra Bladet, a Danish daily tabloid, which reviewed a presentation by zoologist Dr Anton Frederik Bruun at Danmarks Akvarium. Bruun had entertained his audience with stories of sea snakes, and as a scientist he would not reject the possibility that, in the vast unexplored depths of the oceans, one might find creatures that were monster-like sea snakes.
Hakon Mielche contacted Bruun, who was able to confirm the quotations reported in the newspaper, and thus the idea of the deep-sea expedition Galathea 2 was conceived. The sea snakes were never discovered, but Galathea 2 nonetheless found a place in history as one of the most successful Danish scientific expeditions.

Planning and obstacles.
Another nine years were to pass from the conception of the idea of another Galathea expedition until the frigate Galathea left its quay. Obviously, the Second World War was an obstacle to the realisation of the project, and in addition funds subsequently had to be raised to finance the expedition.
Professor Bruun and Hakon Mielche handled the protracted initial work to organise the expedition, but they were not the only ones to develop a yearning for foreign seas and shores during the Second World War. The Greenland explorers Eigil Knuth and Ebbe Munch were also eager to set out, and also the Mongolia expert Henning Haslund-Christensen had plans for an expedition.
In June 1945, they all gathered at Hakon Mielche’s house in Roskilde. On this occasion, they decided to establish the Danish Expedition Foundation, which was to raise funding for the many expeditions, especially through contributions from expatriate Danes and by collecting a special fee from the sale of cigarettes.
All three expeditions were realised. However, the largest, the deep-sea expedition Galathea 2, only set out five years later, on board the navy frigate Galathea, acquired and re-christened for the occasion.

Vision and retrospect
Galathea 2 sailed from Langelinie in Copenhagen on a grey October day in 1950. She was a fine ship: 80 metres from the prow to the stern, 11 metres wide and with a weight of 1,600 tons. The two steam turbines were able to propel the ship at a speed of 12 knots.
The scientific results that the expedition brought home after two years on the oceans in many ways exceeded expectations, even though the voyage had to be shortened because of financial constraints. Among the side-activities on Galathea 2 were ethnographical surveys. The research scientists on Galathea 2 followed up on the findings from the first Galathea expedition in order to document development over the intervening period. Thus, the expedition visited several of the destinations that Galathea 1 had also visited more than 100 years earlier.
One of these destinations was the not particularly well-known former Danish colony the Nicobar Islands in the Bay of Bengal.
For the Galathea 2 Expedition, dissemination of information and relations with the public were an important element for the first time. Under the leadership of Hakon Mielche, changing journalists and film crews sailed onboard the ship, and their reports home about  the project generated deep popular support. More than 20,000 Danes went to the Langelinie quay in Copenhagen to welcome the frigate when she returned on 29 June 1952.

Results.
For the scientists on Galathea 2, the expedition reached its absolute zenith in the early hours of 22 July 1951 when they brought back onboard a bag that had made the journey 10,190 metres down into the deep of the Philippine Trench.
The bag contained pale sea anemones, Gammarus shrimps, mussels and sea cucumbers, which together provided incontrovertible evidence that life is found at depths where the pressure is extremely high: 1 ton per square centimetre.
Galathea 2 succeeded in demonstrating the existence of 115 different animal species at depths of more than 6,000 metres, including a fish that was caught in the Java Trench, 7200 metres below sea level.
The vast majority of animals found in the deep sea were still unknown to science at that time. The head of the expedition, Professor Bruun, gave the deep-sea zone the name "Hadal", derived from the word ‘Hades’, the realm of the dead in Greek mythology.

Small mollusc with large significance.
The greatest single discovery was the proto-mollusc Neopilina galatheae, just under a dozen specimens of which the expedition caught at a depth of 3,600 metres north of the Panama Gulf. Until then, scientists had believed that the ancestors of this small creature, which is about 3 cm long, had become extinct 350 million years ago.

Foreign scientists subsequently proclaimed that the finding of Neopilina was the greatest zooligical discovery in a hundred years, and that this catch alone justified the entire expedition.
A major part of the finds from Galathea 2 are today kept at the Zoological Museum, Natural History Museum of Denmark, Copenhagen.