Prowling about a section of the old A815 which lies, almost in it's entirety between the current road and the shore along Loch Fyne, I found a hut and several underwater cables on the beach.  According to the largest scale osgetamap it is a Post Office Submarine Cable Terminal.  Strangely despite the fact that there were several cables of varying ages on the beach only one cable seemed to have entered the hut.  The latter is quite modern and constructed of lightweight metal.  The door had been stoved in whether by vandals or the action of the sea was unclear.  No signs of any manholes to connections for the other cables were found.

These are not apparently all that uncommon as the os maps show another further south on the same shore and one on the shore opposite.

Pictures at http://picasaweb,google.co.uk/TheFoxSecS/POSubTerminal

I don't know if it worth a summary page although the plurals rule could be a problem.  Possibly the plural Termini would bend the rules?

Just call it a station or substation (maybe a subsubstation in this case   ), then the plural aspect is covered.

Since it's really a cable transition point, from submarine to land, I wouldn't class it as a terminal as it's only a end/start of a section, not the whole line. But I don't know how the official designations run for these things.

The big book of words gives plural of terminus as termini/terminuses.

More relevantly, it looks a bit temporary in some respects - quick to install and assemble, and abandon or remove later, possibly proven by the easily "removed" door.

The bollard, or whatever it is, is rather intriguing. We have very similar items nearby, but the top is covered by a gasketed plate bolted on the top flange. This comes in two variants, either a straight blanking plate, or fitted with a shutoff valve to allow gas samples to be drawn from the ground below. If it wasn't just inside a door without a road or access, I'd have suggested it was a nasty, but warranted surprise for anyone that wanted to try ram-raiding the little hut.

This is the first instance I've come across of such an OS map marking actually being related to an identifiable feature on the land.