The effect of increasing hydrostatic pressure on the microbial degradation, the organic matter composition, and the microbiome of 'marine snow' particles was studied in laboratory incubation experiments. Model aggregates were produced from the diatom Skeletonema marinoi and the natural microbial community of surface seawater collected in the Kattegat. The aggregates were incubated individually in rotating pressure and control tanks to keep them suspended during 20-day incubations in the dark and at 3°C. In the pressure tanks, hydrostatic pressure was increased at increments of 5 MPa per day to finally reach 100 MPa. This pressure scheme simulates the descent of diatom aggregates from the surface ocean down into a 10-km deep hadal trench. In the control tanks, pressure was always left at atmospheric level.The activities of 5 exoenzymes (leucine-aminopeptidase, beta-glucosidase, laminarase, pullulanase, chondroitin sulfatase) associated with diatom aggregates were determined using fluorescently labeled substrates. Volumetric exoenzyme activities were calculated from the temporal change in fluorophore concentrations and the individual aggregate volume for samples retrieved every 4-8 days throughout the 20-day incubation experiment.