This paper offers a geopolitical investigation of the settler-colonial reverberations of SONAR technology. These reverberate through “slices of slow chaos” (Grove 2019, p. 134). To trace these slices through storied vignettes of SONAR reverberations and their felt affects at select beaches, specifically the sites of whale strandings across Hawai‘i, I document and aim to amplify soundscape interruptions to marine life with a focus on the seascape epistemologies offered by Indigenous articulations for alternative, decolonial futures that do not treat marine mammal bodies as sacrificial lives to be killed in pursuit of national security but central to the vitality of community health and culture.