The seabed was drilled, and were taken from the borehole core suction water.
At the time of the last planetary glaciation, 20 thousand years ago, when Arctic glacier reaches to about the latitude of Tambov, a considerable portion of the earth’s water was concentrated in it. Because of this, the ocean level was lower, the amount of water in it less, and its salinity more.
This writes the Chronicle.info with reference to popmech.ru.
Until recent days, scientists could judge this time and his terms only on circumstantial evidence like the chemical composition of coral reefs. Now they can have real water ice age. Anyway, so scientists think.
The purpose Oceanographic expedition working near the Maldives on the drilling ship JOIDES Resolution, initially, was to study the seasonal dependence of the composition of the water from the monsoons.
For this, the seabed was drilled, and were taken from the borehole core suction water. In some places its salinity was anomalously high. This level is atypical for the modern ocean, but roughly coincides with what would have to be there at the time of the last glaciation.
A careful study of the composition of the water allowed the study authors to assert that the content of some other substances also consistent with what would have to be 20 thousand years ago.
In the waters of the Thames saw the whale-Beluga. Video
Apparently, this is ancient water that has been preserved in low permeability limestone reservoirs in the glacial period.
To see the details in the article, published in Geochimica et Cosmochimica Acta.