Purpose: The purpose of this paper is to explore how university fieldtrips progressively deepen student engagement, and explain that stage-by-stage using the organismic integration theory. Design/methodology/approach: Using reflective logs, follow-up focus groups after two years and facilitator observations, this Malaysian qualitative study followed 12 business students across two three-day rainforest fieldtrips. Findings: Students progressed toward greater -- and enduring -- engagement, and transferable socio-cognitive skills, via three thematic stages. Voice and self-reflection -- motivated by protecting group harmony -- were key, enabled by facilitator and peer encouragement. Research limitations/implications: This exploratory study invites research in specified education cultures. Further, a longitudinal, quantitative study could be designed to examine the conceptual framework developed in Figure 1. Practical implications: University curricula, especially in collectivist high power distance cultures, should include fieldtrips as a particularly powerful form of experiential learning. Benefits of deeper engagement extend beyond present to future courses and the workplace. Higher student attraction/retention and employability may follow. Intrinsic motivation grows through the student-instructor interaction, watching theoretical principles in action, and having eureka moments through reflection, expression and exchange of ideas. Originality/value: The research fills a gap by mapping student engagement progressively from extrinsic to intrinsic motivation along with socio-cognitive competencies. The authors reveal the centrality of voice and reflection to promote group harmony, explain the roles of facilitators and peers and show long-lasting transferable benefits to learning. Novelly, the authors provide empirical support for existing conceptual frameworks but also extend these.