In the event you surface and realize that you exceeded the maximum dive time, you should take some preventative measures to reduce the risk of developing decompression sickness. These include:

1. Avoid diving for at least 24 hours.
2. Breathe 100% oxygen if available.
3. Drink plenty of fluids to stay hydrated.
4. Monitor yourself for symptoms of DCS.
5. Seek medical attention and hyperbaric chamber treatment if you suspect you have DCS.

Under no circumstances should you return to the water in an attempt to decompress. Doing so places you at severe risk of drowning while serving little to no decompression benefits.