It seems like someone (not GO-NAD!) has read too many Tom Clancy novels … or watched too many of the movies made from them.
Those big liquefied gas tankers would make tempting targets. And any ship that large would be difficult to operate in convoys.
Agreed. Spoken like a true submariner. For US Navy submariners, aircraft carriers were nothing more than a big juicy target. US carriers were always the prime target of the Soviet Navy. And yes, even back in the early 1960s, the Soviet subs were armed with nuclear torpedoes. (So were the US boats, but the USN would neither confirm nor deny anything about their capabilities.)
In the early 1970s, even though the US Navy knew plenty about finding and tracking Soviet subs, they still poured maximum effort into the job – taking no chances at missing one of them. They not only tried to follow Soviet subs as they left their ports in Murmansk and Petropavlosk, they listened to them with elaborate underwater acoustic listening networks (see
SOSUS), and they intercepted their rare radio transmissions allowing radio-direction-finding location, and decryption of their messages. (I did that during my time in the USN. See
Wullenweber and
AN/FLR-9 for brief descriptions.)
There was a huge world-wide anti-submarine side of the USN (as well as Canadian, UK, Australian and New Zealand Navies) that wasn't nearly as glamorous as carrier aviation. It included attack subs (SSNs), fleets of anti-sub patrol aircraft capable of rapidly searching 10,000 to 100,000 miles² of open ocean, anti-sub destroyers equipped with sophisticated sonar and helicopters with underwater listening devices. I could go on, but you get the point. The USN was not confident that they could never miss a Soviet sub. The consequences of missing just one SSN or SSBN were enormous.
That was a long time ago. Now, there are fewer Russian subs than during the Cold War, but they're much quieter than in the Cold War days of the 60s and 70s. It would be very dangerous to underestimate them.