Read the following passage carefully:
Prior to launching the Deep Trench Hydrothermal Survey in 2015, marine geologist Dr. Aris Thorne spent over a decade refining deep-sea core sampling protocols. His interest in benthic sediments began in 2001 during an undergraduate expedition off the coast of Iceland. In 2008, three years after earning his master's degree in sedimentology, Dr. Thorne published a preliminary paper on abyssal clay composition that attracted international attention. That publication led directly to his appointment as chief researcher at the Oceanic Institute in 2010. However, as Dr. Thorne noted in a 2022 retrospective, his team's most vital instrument—a high-pressure core extraction cylinder—was designed and patented in 2006, well before his appointment at the Institute.
Based on the passage, place the following events from Dr. Thorne's career in chronological order from earliest to latest.
- 1Dr. Thorne participated in an undergraduate expedition off the coast of Iceland.
- 2Dr. Thorne designed and patented the high-pressure core extraction cylinder.
- 3Dr. Thorne published a preliminary paper on abyssal clay composition.
- 4Dr. Thorne was appointed chief researcher at the Oceanic Institute.