The cave was first excavated in 1886 by Joseph Hatzidakis, President of the Syllogos at Candia, and
F. Halbherr. In 1896,
Sir Arthur Evans investigated the site. In 1898 Pierre Demargne conducted brief investigations, followed by
David George Hogarth of the
British School at Athens in 1900 who carried out more extensive operations. Hogarth's reports published in 1900 give a picture of the destruction wrought by primitive archaeological methods: immense fallen blocks from the upper cave roof were blasted before removal; the rich black earth had been previously ransacked. The
stuccoed altar in the upper cave was discovered in 1900, surrounded by strata of ashes, pottery and "other refuse", among which were
votive objects in
bronze,
terracotta, iron and bone, with fragments of some thirty
libation tables and countless conical ceramic cups for food offerings. Bones among the ash layer attest to
sacrifice of bulls, sheep and goats, deer and a boar. The undisturbed lowest strata of the upper cave represented the transition between Late Minoan
Kamares ware to earliest
Mycenaean levels; finds represented the Geometric Style of the ninth century BCE, but few later than that. More recent excavation has revealed the use of the cave reached back to Early Minoan times, and votive objects attest to the cave's being the most frequented shrine by Middle Minoan times (MM IIIA). The lower grotto falls steeply with traces of a rock-cut stair to a pool, out of which
stalactites rise. "Much earth had been thrown down by diggers of the Upper Grotto," Hogarth reported, "and this was found full of small bronze objects." In the vertical chinks of the lowest stalactites, Hogarth's team found "toy
double-axes, knife-blades, needles, and other objects in bronze, placed there by dedicators, as in niches. The mud at the edge of the subterranean pool was also rich in similar things and in statuettes of two types, male and female and
engraved gems." In 1961, the art historian and archaeologist
John Boardman published the finds uncovered by these and other excavations. While clay human figurines are normally found in
peak sanctuaries, Psychro and
the sanctuary on
Mount Ida stand out as the only sacred caves that have yielded human figurines. Psychro is also a unique sacred cave for a bronze leg, also known as a votive body part, which is the only votive body part to be found in a sacred cave. More common
sacred cave finds at Psychro include stone and ceramic lamps. Psychro yielded an uncommon number of semi-precious stones, including
carnelian,
steatite,
amethyst,
jasper and
hematite. Psychro's artefacts are now on display at the
Heraklion Museum, the
Ashmolean Museum in
Oxford, the
Louvre and the
British Museum. ==Idaean Cave==