Key vessels in the Horizon Timeline.
		
		Oil Hunter - M1 (1974 - 1984) Chase boat 1983 - 1984  
		Northern Horizon - M2 (1980 - 1987) Operations suspended 1st September 1986  
		Shallow water exercise with two Rotork Landing Craft in Poole Bay - M3 (1981)  
		Pacific Horizon - M4 (1981 - 1999)  
		Caribbean Horizon - M5 (1982 - 1997)  
		G.A. Reay (1986) Used as a source vessel (high explosives) with the Pacific Horizon  
		M6  
		M7  
		Seaway Labrador / Simon Labrador / Labrador Horizon - M8 (1988 - 1999)  
		Master Tor - M9 (1992)  
		Professor Ryabinkin (1992)  
		Toisa Sentinel - M10  
		Casey Chouest - M11 (1992 - 1993)  
		Gary Chouest - M12 (1992 - 1994)  
		Jonathan Chouest Used as a source vessel with the Discoverer  
		Ross Chouest - M14 (1992 - 1993)  
		Sara Maatje V - M15 (1996)  
		Discoverer - M16 (1994 - 1999)  
		Abshire Tide - M16U (1996 - 1998)  
		Sara Maatje V (1997?)  
		Celtic Horizon - M90 (1998 - 1999)  
		Austral Horizon - M19 (1998 - 1999)  
		Atlantic Horizon - M20 (1999)  
		   
		Any others we have missed?  Please mail and let us know.          
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