Table 2.

Maximum depth of corrosion attacks measured along the seabed chains retrieved in 2016, 2019 and 2023.

Zones on the bottom chain	Maximum depth of corrosion attacks (mm)
	2016*	2019	2023
Zone 4a: 0–50 m from the wire	1	5	5
Zone 4b: 50–300 m from the wire		2	3
Zone 3: Touch down. 300–400 m from the wire	~0	1	~0
Zone 2: More than 400 m from wire. Always in the seabed sediments	4	~0	–
Zone 1: Last links against the suction anchor. More than 2 m into the seabed sediments	~0	~0	–

Uncertainty is ±0.2 mm.

^*Gabrielsen et al. (2018).