The safety of sea turtles has been a rising concern with the increase in technological innovations of marine renewable energy. While renewables are a valuable asset to providing clean energy globally, the implications that these machines may have on marine life have not been thoroughly investigated. It is crucial to examine the mechanical properties of the sea turtle shell across species and life stages to better understand how well these creatures can withstand force when interacting with renewable systems. Small samples of shell bone were compiled from 6 individuals, across four species of sea turtle, for mechanical testing. This was added to an existing dataset on shell material properties. Samples were compressed using an Instron material tester to assess the shell's resistance to deformation. Samples from 10 turtles were later scanned using micro-computed tomography to quantify and describe the micro-structure of the shell layers. Mechanical testing results were then compared with multiple bone variables to assess potential structure-function relationships. This study observed a significant correlation between trabecular thickness and cortical porosity with stiffness increasing as trabecular thickness increased and porosity decreased. Overall, shells were considered compliant across all species. By investigating the microstructure of the sea turtle shell, we can achieve an increased understanding of the implications marine renewable energy sources may have on sea turtle ecology.