At fifteen feet, small buoyancy problems become obvious. Your cylinder is lighter, gas in your BCD or drysuit expands as you ascend, and a few feet of unintended movement can quickly become more. A diver who has been quietly finning to maintain depth may suddenly discover how much work those fins were doing.
A good safety stop should be uneventful. You reach the intended depth already in control, maintain it without constant adjustments, and leave together when the team is ready.
What the Stop Is For
On a recreational no-stop dive, a safety stop adds shallow time for dissolved inert gas to leave the body before surfacing. A familiar practice is three minutes around 15 to 20 feet, although procedures vary by training, dive plan, and computer. It adds a margin of safety; it does not replace a required decompression stop.
I sometimes prefer a gradual, staged ascent, but when diving with recreational buddies I generally use the familiar three-minute stop. Our Recreational Decompression article explains why a so-called no-decompression dive still involves decompression during ascent.
Arrive Already Under Control
As you ascend, vent expanding gas from your BCD or drysuit before it accelerates you. A deliberate approach, around ten feet per minute or slower near the stop when conditions allow, gives you time to manage that expansion. Begin leveling off before you overshoot the intended depth, releasing gas as necessary rather than waiting until you are already rising too quickly.
Correct weighting and buoyancy control make the shallow part easier. Too much weight means more gas in the BCD to manage; too little can make holding the stop difficult as your cylinder empties. Once stable, use small equipment adjustments when needed and let ordinary breathing handle the minor changes around neutral buoyancy.
Hold Depth Without Fighting It
Settle into a comfortable position and stop unnecessary finning. Your depth will move slightly with each breath, and that is normal. Watch whether you're consistently rising or sinking rather than chasing every small movement with a kick or a burst from the inflator.
If you begin rising, stop unnecessary finning and exhale slowly. If expanding gas in your BCD or drysuit is driving the ascent, release the excess gas rather than attempting to compensate through breathing alone.
If you begin sinking, take a deeper breath and briefly hold it for two or three seconds while descending. The additional lung volume can arrest a small downward movement, and a gentle kick can help you regain your intended depth. Once stable, resume normal breathing and evaluate whether you need a small equipment adjustment.
Trim can complicate this. A diver whose feet drop whenever they stop moving may be using finning to correct body position and inadvertently changing depth. The Trim and Body Positioning and How to Hover articles cover those underlying problems in more detail.
Stay With Your Buddy, Not a Point on the Bottom
Holding fifteen feet doesn't mean remaining above one particular spot. On a drift dive, you and your buddy may travel with the current while maintaining the correct depth. Fighting that movement can waste gas and make a simple stop unnecessarily difficult.
An ascent line or nearby wall can offer a depth reference when appropriate. In open water, a deployed surface marker buoy may help the boat locate your team. In surge or chop, stay clear of obstacles and use a manageable stop depth consistent with your dive plan and conditions.
I prefer to be facing my buddy during the safety stop so we can monitor one another directly. Keep track of depth, time, and remaining gas, and confirm that both divers are ready before leaving the stop. A computer ending its countdown is not permission to abandon your buddy.
Know When to Finish
Extra shallow time can be reasonable when conditions and gas supply permit, but spending longer underwater is not automatically safer. Low gas, equipment trouble, illness, or worsening conditions may make a voluntary safety stop inappropriate. In those circumstances, prioritize a controlled ascent and the appropriate emergency response. A mandatory decompression obligation is a different matter and cannot simply be treated as optional.
The last fifteen feet still require attention. Gas continues expanding as you ascend, so vent when needed, breathe normally, and remain with your buddy. At the surface, establish positive buoyancy before turning to the boat, shore, or whatever comes next.