A system comprising: a processor; a memory coupled to the processor; wherein the memory stores a program that, when executed by the processor, causes the processor to: calculate a pressure response of a first sensor; and correct pressure wavefield data obtained from the first sensor responsive to a first acoustic wavefield propagating in a water body, the correction based on the calculated pressure response of the first sensor; wherein: the calculated pressure response of the first sensor is responsive to a second acoustic wavefield propagating in the water body and having a propagation path between a source of the second acoustic wavefield and the first sensor; and the propagation path includes no reflection from a subsurface formation; characterised in that the program further causes the processor to: calculate a fluid particle velocity response of a second sensor; and correct a component of fluid particle velocity wavefield data obtained from the second sensor responsive to the first acoustic wavefield, the correction based on the calculated fluid particle velocity response of the second sensor; wherein the calculated fluid particle velocity response of the second sensor is responsive to the second acoustic wavefield at a position of the second sensor co-located with the first sensor. a processor; a memory coupled to the processor; wherein the memory stores a program that, when executed by the processor, causes the processor to: calculate a pressure response of a first sensor; and correct pressure wavefield data obtained from the first sensor responsive to a first acoustic wavefield propagating in a water body, the correction based on the calculated pressure response of the first sensor; wherein: the calculated pressure response of the first sensor is responsive to a second acoustic wavefield propagating in the water body and having a propagation path between a source of the second acoustic wavefield and the first sensor; and the propagation path includes no reflection from a subsurface formation; characterised in that the program further causes the processor to: calculate a fluid particle velocity response of a second sensor; and correct a component of fluid particle velocity wavefield data obtained from the second sensor responsive to the first acoustic wavefield, the correction based on the calculated fluid particle velocity response of the second sensor; wherein the calculated fluid particle velocity response of the second sensor is responsive to the second acoustic wavefield at a position of the second sensor co-located with the first sensor. calculate a pressure response of a first sensor; and correct pressure wavefield data obtained from the first sensor responsive to a first acoustic wavefield propagating in a water body, the correction based on the calculated pressure response of the first sensor; wherein: the calculated pressure response of the first sensor is responsive to a second acoustic wavefield propagating in the water body and having a propagation path between a source of the second acoustic wavefield and the first sensor; and the propagation path includes no reflection from a subsurface formation; characterised in that the program further causes the processor to: calculate a fluid particle velocity response of a second sensor; and correct a component of fluid particle velocity wavefield data obtained from the second sensor responsive to the first acoustic wavefield, the correction based on the calculated fluid particle velocity response of the second sensor; wherein the calculated fluid particle velocity response of the second sensor is responsive to the second acoustic wavefield at a position of the second sensor co-located with the first sensor. the calculated pressure response of the first sensor is responsive to a second acoustic wavefield propagating in the water body and having a propagation path between a source of the second acoustic wavefield and the first sensor; and the propagation path includes no reflection from a subsurface formation; characterised in that the program further causes the processor to: calculate a fluid particle velocity response of a second sensor; and correct a component of fluid particle velocity wavefield data obtained from the second sensor responsive to the first acoustic wavefield, the correction based on the calculated fluid particle velocity response of the second sensor; wherein the calculated fluid particle velocity response of the second sensor is responsive to the second acoustic wavefield at a position of the second sensor co-located with the first sensor. calculate a fluid particle velocity response of a second sensor; and correct a component of fluid particle velocity wavefield data obtained from the second sensor responsive to the first acoustic wavefield, the correction based on the calculated fluid particle velocity response of the second sensor; wherein the calculated fluid particle velocity response of the second sensor is responsive to the second acoustic wavefield at a position of the second sensor co-located with the first sensor.