M. NourbeSe Philip’s 2008 book-length poem Zong! represents maritime materialities below the sea’s surface in relation to aesthetic geographies of the sea in the aftermath of slavery as an abyss of loss, thereby extending modernist aesthetics while offering a strategic and revisionary response to male-centered modernist writing. Keen attention into the sea as an innovating and renewing source reveals that the poem imagines the sea as a literal, formal, and thematic agent for the “decontamination” of language—which, Philip maintains, is contaminated by imperialism—and of the received history about slavery. The poem focuses its investigation on the case of the 1781 Zong massacre and the Gregson v. Gilbert maritime insurance case that arose in its wake. Zong! mourns the massacre of 150 Africans who were thrown overboard so that owners of the slave ship could collect insurance money on lost “cargo”. In conversation with Caribbean poets and thinkers, such as Grace Nichols, and African oral traditions, the poem explores forms of memory that go beyond the non-history officially afforded to the enslaved and their descendants. Throughout the poem, the sea is a site of decontamination through which Zong! stages its attempt to recover the unrecoverable. While many scholars have understandably focused on the events aboard the ship, a small number of ecocritical readings have highlighted the poem’s engagement with the materiality of the sea. Drawing on postcolonial ecocriticism and black feminist theories of the human, this article will discuss the sea as a material geography, going deeper to investigate the poem’s rarely discussed focus on biological and chemical materiality as juxtaposed to representations of black women’s flesh, arguing that it functions as a feminist provocation to both human exceptionalism and the racial boundaries of the human.