To my knowlege theres no type 207 for download in sub command that i know of.
The term Fjord is a long narrow inlet carved by glacical activity, they generally have steep sides created in a valley.
They in some cases can be deeper than the adjacent seas which fills them,Fjords generally have a sill or rise at the mouth caused by recent terminal moraine and in many cases causing extreme currentsand large sea water rapids.
There are diffrent types of Fjords ones in norway are generally deep water mud bottomed sediment from erroded bedrock which gives a silty layer, deepest fjord is sognefjord norway and goes down to 1300meters (only a mike class may go that deep) so the hopes of resting on the bottom is a bit shattered there but there are also shallow water fjords most found in new zealand and they also are home to alot of coral life.
So most are deep at the mouth getting slightly shallower further inland, sedimentary mud and sand bottom from erroded bedrock with strong currents and rapids.
Hope that helps
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