The MINDFUL-ICE II project explores the significance of mindfulness as a psychological trait crucial for extended missions in isolated and confined environments (ICEs). Previous data from the MINDFUL-ICE study with Concordia base crews validated a link between dispositional mindfulness and reduced stress. However, the efficacy of a mindfulness-based intervention in mitigating distress and fostering psychological adaptation within such environments remains untested. This project aims to assess a specific mindfulness training program's efficacy, feasibility, and usability for Concordia base crews over a two-year assignment. The pre-departure online mindfulness training, tailored for the pre-mission period, will feature minimal time commitments. Bi-weekly booster sessions during the mission, conducted by the ESA MD, will support the training. Using a quasi-experimental design, crews receiving this intervention will be compared with the first MINDFUL-ICE study's results. Stress, mindfulness, and psychological data will be tracked throughout the winter-over mission, aligning with the assessment approach of the initial study. Participants will report program usage, acquired knowledge, and engage in post-mission qualitative interviews. Both quantitative and qualitative findings will be crucial in gauging the intervention's effectiveness and usability for future long-duration and ICE space missions.