moscow russia defense ministry send oceanographic research ship south atlantic help search argentine submarine go miss week ago tass news agency report thursday vessel call yantar amber equip two self-propelled deep submergence vehicles allow examine underwater areas 6,000 meter 3.75 miles deep tass quote russian military say dozens plan boat search san juan submarine search enter critical phase wednesday 44 crew board could run low oxygen argentine navy spokesman say german-built submarine service three decades sink otherwise unable rise surface since give last location nov. 15 would use last seven-day oxygen supply russia send research ship help search miss argentine sub