Where can you dive 30 feet deep?
Most often, 30 foot dives will take place in open water. There
are some dive training centers with dive pools that may be deep
enough. If you are planning to free dive (hold your breath at
surface, dive, and return), you can go out into open water and try
some free diving, shallow at first. Do not do this without a
swim/dive buddy. If you want to dive SCUBA, you'll need to get
certified first to avoid killing yourself. When ascending after
breathing air under pressure, you'll need to do it properly. Free
dive or SCUBA dive, I would never recommend diving without a
swim/dive buddy with you.