The Pozzo del Merro (Merro sinkhole), a few kilometres\ud
away from Rome, Italy, is the deepest flooded\ud
karstic cavity known in the world. Over the last two\ud
years, a multi-disciplinary scientific research project\ud
studied the almost unknown aquatic ecosystem of\ud
the sinkhole while also studying the psychological and\ud
physiological reactions of scientific divers operating in\ud
the very hostile underwater environment. This paper\ud
presents a preliminary overview of the seven studies\ud
carried out in parallel and attempts to highlight the\ud
fundamental role of scientific diving in contributing to\ud
increased knowledge about this extreme environment.\ud
The discovery of two exotic species in the sinkhole\ud
represents a paradigmatic case of the problem\ud
of invasive species introduction in such a unique\ud
environment. The project also included research on\ud
human diving physiology, pathology, and psychology\ud
through monitoring of all the divers (plus one free-diver)\ud
working in the Merro sinkhole
This paper aims to present a set of painted marks and inscriptions on stone blocks from El Mèdol quarry (Tarragona), the limestone quarry which supplied the stone used to build most of the public edifices, including what is known as the Provincial Forum, in the nearby town of Tarraco, capital of Hispania Citerior. There are 16 marks in red paint and 3 written in charcoal, all linked to the phases of extracting and shaping the stone.
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