Could Argentina have stationed a submarine near Ascension?

Could Argentina have pre-positioned a submarine near Ascension Island in 1982, and did Britain fear that possibility?

It was possible with the one available submarine and tanker support, and the concern was real enough for early British arrivals to sanitize the area.

The deployment is treated as theoretically possible with the one available submarine, provided Argentina could arrange tanker support. The possibility also concerned the British. Anti-submarine frigates were among the first arrivals at Ascension to clear the area. Peacetime caution over uncertain contacts is contrasted with a wartime willingness to use depth charges or torpedoes when a contact might be a submarine.