  We have conducted an extensive towed-magnetic-sled survey during the period
14-28 June, 2023, over the seafloor centered around the calculated path of the
bolide CNEOS 2014-01-08 (IM1) about 85 km north of Manus Island, Papua New
Guinea. We found about 700 spherules of diameter 0.05-1.3 millimeters in our
samples, of which 57 were analyzed so far. The spherules were significantly
concentrated along the expected meteor path. Mass spectrometry of 47 spherules
near the high-yield regions along IM1's path reveals a distinct extra-solar
abundance pattern for 5 of them, while background spherules have abundances
consistent with a solar system origin. The unique spherules show an excess of
Be, La and U, by up to three orders of magnitude relative to the solar system
standard of CI chondrites. These "BeLaU"-type spherules, never seen before,
also have very low refractory siderophile elements such as Re. Volatile
elements, such as Mn, Zn, Pb, are depleted as expected from evaporation losses
during a meteor's airburst. In addition, the mass-dependent variations in
$^{57}$Fe/$^{54}$Fe and $^{56}$Fe/$^{54}$Fe are also consistent with
evaporative loss of the light isotopes during the spherules' travel in the
atmosphere. The "BeLaU" abundance pattern is not found in control regions
outside of IM1's path and does not match commonly manufactured alloys or
natural meteorites in the solar system. This evidence points towards an
association of "BeLaU"-type spherules with IM1, supporting its interstellar
origin independently of the high velocity and unusual material strength implied
from the CNEOS data. We suggest that the "BeLaU" abundance pattern could have
originated from a highly differentiated magma ocean of a planet with an iron
core outside the solar system or from more exotic sources.
