A mobile marine apparatus has a platform, telescopic legs for supporting the platform, each telescopic leg having at least one inner section slidably mounted within an outer section, a frame member attached to the lower ends of the outer sections, a mat attached to the lower ends of the inner sections, locking means to selectively restrain relative movement between the sections and a jacking mechanism on the platform for selectively effecting or restraining relative movement between the platform and the sections and between the sections.
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