> and the cost to get it into place...

Your comment reminded me of "No Time on Our Side," a book about a submersible laying cable near the UK that sunk after a hatch failed during recovery operations. The author (who was a pilot in the submersible) details the incredible rescue effort to bring them back to the surface alive over a period of about 3 days.

A wonderful book and also one that made me appreciate how hard it is to lay cable (in some places).