Working on the principle that ‘the more you know, the more you see’, Indonesian expedition cruise operator, SeaTrek Sailing Adventures, has expanded its series of expert-led cruises for 2023 and 2024 with the addition of marine biologist, Vincent Chalias, who will lead two end-of year cruises to explore the Jewels of Raja Ampat departing 29th December 2023 and 10th January 2024.