There is disclosed a floating system positioned in a body of water having a water bottom, the system comprising a host member floating in the water; an elongated underwater line structure, comprising a top connected to the host; a bottom extending to the seabed and adapted to connect to a flowline lying on the seabed; a first portion of the line structure being shaped concave upward; a second portion of the line structure being shaped concave upward; and a transition segment between being shaped concave downward, the transition segment located between the first portion and the second portion.
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