Culturally Grounded STEM Education: Three Cases of Broadening Participation Among Indigenous Islanders

US-affiliated Island nations and territories are home to diverse populations, including substantial Indigenous communities who have extensive exposure to marine and geoscience content, with some of their knowledge sustained through heritage practices. Despite this demographic presence, Indigenous peoples of the Pacific remain notably underrepresented in STEM fields, particularly in the geosciences and marine sciences. Beyond an equity gap in participation, this underrepresentation reflects broader issues of epistemic and representational justice, raising questions about whose knowledge is validated and whose voices are legitimized in scientific spaces. This study examines how Pacific university bridge programs support Indigenous islander participation in authentic STEM research, with particular focus on climate adaptation, environmental change, and marine science contexts. Through qualitative interviews with Micronesian participants in the SEAS (Supporting Emerging Aquatic Scientists) Islands Alliance, we analyzed STEM identity development as students navigated cultural and scientific identities. Findings emphasize the critical importance of sustained, mentored engagement in real-world scientific inquiry that meaningfully connects to ongoing research agendas and community well-being, rather than simulated classroom exercises. The study offers insights into the multifaceted influences affecting student participation and pathways through STEM.