Summary: The dynamics of the subsurface layer of a body made of nickel alloy has been studied for the case when the body surface is exposed to a load represented by a pulse action of a liquid microjet arising from collapse of an attached-to-the-body cavitation bubble in water. The velocity range in which the stress intensity in the body briefly attains the level of the yield strength has been considered. The mathematical model of an elastic-plastic body and the fundamentals of the numerical technique used in the study are given. It is shown that due to the extension of the loading domain on the body surface, the non-uniformity of the load and the abrupt decrease of the load at the edge of the loading domain, the stress intensity limit in the body is reached at the considerably (nearly two times) lesser jet velocities than in the corresponding one-dimensional approximation. The non-uniformity of the load does not lead to qualitative changes in the body dynamics; its influence decreases with an increase in the jet velocity.