Background: Engineering culture research to date has described the culture as rigid, chilly, and posing many barriers to entry. However, the COVID-19 pandemic provided an important opportunity to explore how engineering culture responds to a major disruption. Purpose: The purposes of this study are to understand how elements of engineering culture emerged in mechanical engineering students' perceptions of their classroom experiences during the pandemic and how their experiences varied across two national contexts. Method: This qualitative comparative case study examines undergraduate mechanical engineering students' perceptions of their experiences taking courses during the pandemic at two universities--one in the United States and one in South Africa. Semistructured interviews were conducted across both sites with 21 students and contextualized with 3 faculty member interviews. Student interviews were analyzed using an iterative process of deductive coding, inductive coding, and pattern coding. Results: We identified two key themes that characterized participants' experiences during the pandemic: hardness and access to resources. We found that students at both sites experienced two types of hardness--intrinsic and constructed--and were more critical of constructed forms of hardness. We found that the South African university's response to facilitating student access to resources was viewed by students as more effective when compared with the US university. Conclusions: We found that hardness remained a central feature of engineering culture, based on student perceptions, and found that students expressed awareness of resource-related differences. A key distinction emerged between intrinsic and constructed hardness.