Tidal-driven seawater pump (100) with a socket (111) arranged to rest upon the seabed. A buoyance means (101) is connected to a piston (102) accommodated slidably in a closed cylinder (108) with a lower compartment (109) with top wall (112). A seal (113) is provided along the periphery of the piston (102). The cylinder (108) exhibits an upper inlet valve (106A) and a lower inlet valve (106B), and an outlet for pumping seawater in the cylinder (108) to the sea surface either through upper outlet valve (107A) or lower outlet valve (107B). The buoyance means (101) is accommodated slidably in a housing (110) having an upper compartment (117) with an upper open end (110A), and having a lower end delimited by the top wall (112) of the lower compartment (109). The housing (110) is provided with a number of flow apertures (115) to allow exchange of seawater between the environments and the upper compartment (117) of the protective housing (110).
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