TY JOUR TI ON NECESSITY TO CREATE UNDERWATER OIL AND GAS FLEET FOR DEVELOPING OIL AND GAS FIELDS IN LONG-FROZEN DEEP ARCTIC SEAS KW oil and gas fleet KW deep-water freezing sea areas KW ice effects KW oil and gas extraction and drill rigs KW hydrocarbon resources JO Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies AU Guseinov, C.. AU Kulpin, D.. AU Efimova, G.. PY 2019 IS PB Astrakhan State Technical University