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 trip line is usually a nylon rope connected to a buoy or to the chain 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 trip line, release the tension of the chain, and release your anchor using the trip line.
The invisible Trip Line is a better option than the one connected to a buoy and this is how you set it up.
Attach a strong floating line, preferably Dyneema (Dyneema floats and it is stronger than polypropylene). The length of the rope is determined by typical anchoring depths.
When anchoring, attach the line to the shank nearest the heel of the anchor most anchors have a eye for this purpose.
Deploy the rode (chain, of course) and attach the other end of the trip line a couple of feet ahead of its length, for example, a 30-foot trip line should be tied to the rode at 28 feet, or so so it will float above the chain but far beneath the surface. continue deploying your chain as usual.
That's it. the trip line is out of the way and hidden below the surface. when retrieving the anchor the trip line will show itself attached to the chain long before discovering that the anchor is stuck, If it is stuck, then you can use the trip line that is already on deck, and release the anchor.