The rig was built to withstand a calculated 1 in 10, 000 years wave with a predicted height of and was also fitted with state-of-the-art laser wave recorder on the platform s underside.
2.
A series of Trinity House lightships stationed near the Sevenstones Reef have measured significant wave heights ( " Hs " or " SWH " ) the periodic average of the highest one third of waves in a spectrum since the early 1960s using Ship Borne Wave Recorders ( SBWR ).
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