the hadal zone (depths exceeding 6000m). He designed and constructed two full ocean depth rated landers to carry baited cameras, traps and other sensors to depth of nearly 11,000m. Between 2007 and 2013 he participated in and often led a series of seagoing expeditions that included the first finding of the taxonomic order Decapoda at hadal depths (including the deepest prawn ever found), the first video of fish greater than 6000m, filmed the deepest fish in the southern hemisphere, the deepest fish ever filmed (at the time), the deepest eel ever found, and the first footage and discovery of the 'supergiant amphipod' at hadal depths. These were achieved across a series 11 expeditions spanning the Japan, Izu–Bonin, Mariana, Kermadec, New Hebrides, Tonga and Peru–Chile trenches in collaboration with the University of Tokyo's Atmosphere and Ocean Research Institute (AORI; Japan) and the National Institute for Water and Atmospheric research (NIWA; New Zealand). These expeditions also saw the discovery of a hadal amphipod species later to be named after him: Princaxelia jamiesoni. In 2014, Jamieson was a co-Principal investigator on the joint US–UK–NZ Hades projects: Hades-K to the Kermadec Trench and Hades-M to the Mariana Trench. The former was the first expedition to use the HROV Nereus to full scientific capacity. The vehicle was lost during this expedition, but by using spare parts and scrap metal, Jamieson constructed a full ocean depth lander, known as the Wee Trap, that days later captured the deepest fish ever caught, Pseudoliparis swirei. On the second expedition, to the Mariana Trench, he set a new record for the deepest fish (the 'Ethereal snailfish' at 8145 metres deep) and the first video footage of the supergiant amphipod, Alicella gigantea. From 2015 to 2017, Jamieson led the ‘PharmaDEEP’ expedition to the South Shetland Trench in Antarctica on the Spanish naval ship Hesperides and participated in the Japanese RV Shinyo Maru expedition to the Mariana Trench in 2017, with the Tokyo University of Marine Science and Technology for the Discovery Channel documentary Deep Ocean, Descent into the Mariana Trench, produced by NHK. Some of his recent papers includes the deepest cephalopod (octopus) and deepest squid ever filmed, description of the DSV Limiting Factor full ocean depth submersible, a review of the deepest places in each ocean, and a contribution to an industrial scheme to eliminate plastic pollution with Andrew Forrest of the Minder Foundation. A replica of Jamieson's third