Following World War II, between 2000 and 10,000 metric tonnes of chemical weapons,mostly mustard gas, were dumped in the Gotland Basin of the Baltic Sea. This articleexplores these dumps as a dense transfer point for many different, sometimes incommensurabletemporalities. Guided by queer theories of nonlinear temporality, I describethese sulphur mustard times as both making and being made by the materialities of thechemicals, their containers, the bodies with which they come into contact and the sea.These knots of temporalities articulate militarisms and environmentalisms in a tangle ofmultiple pasts and possible futures.