[[file:offshore-rigs_fig3.png|left|thumb|{{figure number|3}}Semisubmersible rigs, (a) Pontoon type semisubmersible. (b) Twin hull semisubmersible. (From <ref name=pt03r50 />.)]] | [[file:offshore-rigs_fig3.png|left|thumb|{{figure number|3}}Semisubmersible rigs, (a) Pontoon type semisubmersible. (b) Twin hull semisubmersible. (From <ref name=pt03r50 />.)]] |