Using a hidden anchor tripping line.
When anchoring in a busy anchorage suspicious of having hazards, debris, or too many mooring chains on the seabed, it is better to have some sort of insurance enabling you to be able to retrieve your anchor in case it gets stuck.
A hidden trip line can be a good option that is worth considering in these circumstances, especially given the problems of a conventional anchor trip line attached to a buoy.
The tripping line is usually a nylon rope connected to a buoy or to the chain is attached to the rear of the anchor on one end and attached to a buoy or the chain on the other end making it visible in case you need to use it.
In case you find out your anchor is stuck and cannot be retrieved all you need to do is grab the tripping line, release the tension of the chain, and release your anchor using the tripping line.
The "Hidden Trip Line" is a better option than the one connected to a buoy and this is how you set it up
Attach sturdy carabiners to each end of a strong floating line, preferably Dyneema (Dyneema floats and it is stronger than polypropylene). The length is determined by typical anchoring depths.
When anchoring, attach the line to the shank nearest the heel of the anchor most have a hole for this purpose.
Deploy rode (chain, of course) and attach the other end of the hidden trip line, a couple of feet ahead of its length, for example, a 30-foot trip line should be attached to the rode at 28 feet or so so it will float above the chain but far beneath the surface. It only takes a second to snag a chain-link using the carabiner as the rode goes by. it's easy to see that you're reaching near the end of the trip line length as the chain gets deployed.
That's it. the trip line is out of the way and hidden below the surface. If raising anchor and it gets stuck, it's usually the anchor getting fouled and the trip line can be easily unhooked from the rode and attached to a line to retrieve the anchor.