Is this a single incident that your talking about, or have you noticed that on multiple occasions this is happening?
The reason I ask is if this happened just once then by trying to keep up with a dive buddy who is swimming for a gold medal is probably the biggest factor. Swimming is swimming whether your on the surface or underwater, if you push to go faster all you do is waste energy and therefore air. talk to your buddy a little and explain to him that you need to be the one setting the pace on the swim out and see if that helps your air consumption.
The reason I ask is if this happened just once then by trying to keep up with a dive buddy who is swimming for a gold medal is probably the biggest factor. Swimming is swimming whether your on the surface or underwater, if you push to go faster all you do is waste energy and therefore air. talk to your buddy a little and explain to him that you need to be the one setting the pace on the swim out and see if that helps your air consumption.