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<p>are not pictured here.</p>

<p><big>Fixed platforms</big></p>
<p>These platforms are built on <a href="page.php?w=concrete">concrete</a> or <a href="page.php?w=steel">steel</a> legs, or both, anchored directly onto the seabed, supporting the deck with space for drilling rigs, production facilities and crew quarters. Such platforms are, by virtue of their immobility, designed for very long term use (for instance the <a href="page.php?w=Hibernia_%28oil_field%29">Hibernia platform</a>). Various types of structures are used: steel jacket, concrete <a href="page.php?w=Caisson_%28engineering%29">caisson</a>,</p><p>
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