A room full of deep-sea biologists exudes a subtle defiance. These individuals dedicate their careers to researching environments that the majority of people will never see, organisms that survive in extreme darkness that makes blindness seem commonplace, and pressures that would crush steel. There was every reason to anticipate a dry conference when 141 of them convened for the 6th Deep-Sea Biology Symposium in Copenhagen during the summer of 1991. That was not the case.
Under the resolute leadership of Torben Wolff and his co-organizers Ole Tendal, Jorgen Kirkegaard, and Reinhardt M. Kristensen, the gathering attracted attendees from eighteen nations, including Germany, the United States, the United Kingdom, Denmark, France, Russia, Japan, and twelve more. Perhaps no deep-sea science conference had ever felt so truly global at the time. Just the numbers were startling. Approximately 75% of the attending authors were present, a participation rate that one observer likened to spawning aggregations of orange roughy with dry Nordic humor.
It wasn’t just the science that made Copenhagen successful. It was the vibe, which was open, casual, and sometimes chaotic in a good way. Although the halls were lined with posters and had a designated hour, attendees’ natural tendency to grab food during free time proved to be almost overwhelming, as was duly noted. There are still certain aspects of conferences that remain unchanged. Nevertheless, with about one-third of all contributions coming from the poster sessions, they held their own. Junior researchers and seasoned scientists received about equal attention due to the balance between formal talks and displayed work, which is more important than program committees often acknowledge.
The scientific scope was truly remarkable. Presentations ranged from deep-sea technology to taxonomy, from the molecular biology of hydrothermal vent organisms to the behavior of holothuroids. The question of how the Earth’s rotation might affect benthic animals—basically, the Coriolis force applied to worms—led to what may be the only scientific paper ever to introduce a unit known as the “Pirouette number.” It remained delightfully unclear whether tidal currents provided a more straightforward explanation or whether the Coriolis effect actually shaped spiral tracks left by deep-sea creatures. The entire meeting seemed to be characterized by that kind of constructive uncertainty.
The biodiversity-focused afternoon was possibly the most significant. Funding gaps, taxonomic neglect, and the frustrating fact that the public didn’t see the deep ocean the way they saw a coral reef or a rainforest were all topics of discussion after John Gage made the direct claim that it was essential to conserve, or at least slow the loss of, species from pristine deep-sea habitats. Reading the notes from that session makes it difficult to ignore how well those worries foresaw the following thirty years. In 1991, issues like deep-sea mining, genetic boundaries between species, and the loss of voucher collections were already being discussed.
During those conversations about biodiversity, one exchange stood out. Philippe Bouchet suggested cataloging all of the world’s species. This could turn into a scientific black hole, according to Tony Rice. According to Ole Tendal, ecologically significant species should be the main focus. In a few minutes of an afternoon symposium, three distinct intuitions about the purpose of science are distilled. Perhaps honestly, no agreement was reached.
Early findings from the DISCOL Impact Experiment, an effort to investigate what happens to the deep Pacific seafloor following intentional disturbance of a manganese nodule field, were also presented at the event. The 1991 symposium had an edge beyond biology thanks to that session and an evening discussion on the effects of deep-sea mining. Resources from the ocean floor were already being considered by the world. The only people who truly understood what that might mean were the scientists in that room.
A farewell dinner at Tivoli Gardens, a reception at Copenhagen Town Hall, and films about the Viking Ship Museum in Roskilde were all held outside of the official sessions. These details serve as a gentle reminder that these gatherings are also about maintaining a sense of community. Funding and papers are important to science, but so are the connections made over poor conference coffee and surprisingly good Scandinavian wine.
After the Copenhagen meeting, Anastasios Eleftheriou and the Institute of Marine Biology of Crete took over, and Iraklion was chosen to host the seventh symposium in 1994. It was a close vote. Some attendees, who seemed to still be processing the week, suggested that future meetings should prioritize posters and give more time for individual talks. It turns out that some aspects of the disagreements among scientists regarding formats are also timeless.
It may seem uncommon, but the 6th Deep-Sea Biology Symposium in Copenhagen managed to create a gathering that was both genuinely human and rigorously scientific. Even now, the ocean below 200 meters is still less mapped than the Mars surface. A few hundred people who were passionate about that fact met in a Danish city in 1991, debated biodiversity, worms, and how to measure a community, and left feeling somewhat closer to one another than when they had arrived. That must be worth something.
