Historical clue formulations

• Offshore drilling site — 2026-01-13
• Workplace for a roughneck — 2023-02-24
• Structure on the continental shelf — 2022-11-06
• Something well-placed? — 2022-01-27
• Sight off the Gulf Coast — 2020-11-17
• Offshore sight, maybe — 2018-12-23
• Pumping station — 2016-12-28
• Where a mud engineer works — 2016-10-01
• Offshore structure for Shell or ExxonMobil — 2016-06-20
• Offshore sight — 2015-06-14
• Offshore installation — 2013-04-07
• Offshore sight — 1999-08-18