Although the Peregrine-type solutions of the nonlinear Sch\"odinger equationhave long been associated mainly with the infamous "rouge waves" on the surfaceof the ocean, they might have a much more interesting role in the oceanicdepths; in this article we show that these solutions play an important role inthe evolution of the intrathermocline eddies, also known as the "oceaniclenses". In particular, we show that the collapse of a lens is determined bythe particular generalization of the Peregrine soliton -- so called exultons --of the nonlinear Schr\"odinger equation. In addition, we introduce a newmathematical method of construction of a vortical filament (a frontal zone of alens) from a known one by the Darboux transformation.
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