One article makes it sound like to me they saw their buddy on the bottom but couldn't bring him up, went to shore (40 miles!), refilled their tanks, and recovered him.
The other article makes it sound like they all surfaced, realized one guy didn't, and then went to shore, refilled their tanks, and recovered him.
It's just my interpretation that in one scenario they actually saw their buddy on the bottom and in the other, they surfaced and realized he didn't. I probably shouldn't put too much thought into the difference between the articles because they're probably both not accurate enough to draw a conclusion from.....