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The acquisition of high-quality deep images of planetary nebulae (PNe) hasallowed the detection of a wealth of small-scale features, which highlight thecomplexity of the formation history and physical processes shaping PNe. Here wepresent the discovery of three groups of clumps embedded within the nebularshell of the evolved PN NGC3587, the Owl Nebula, that had escaped previousdetections. The analysis of multi-wavelength GEMINI GMOS, NOT ALFOSC,Aristarchos Andor optical, CFHT WIRCam and Spitzer IRAC and MIPS infrared (IR)images indicates that these clumps are formed by material denser and colderthan the surrounding nebula, with a notable content of molecular H2, butnegligible or null amounts of dust. The presence of H2-rich pockets embeddedwithin the ionized shell of this evolved PN is suggestive of the survival ofhigh-density condensations of material created at the onset of the PN stage.

H$_2$ molecular gas in the old planetary nebula NGC 3587