In relatively deep water like Mauritania, the deviated well is more likely due to geo concerns, like approaching a fault squarely, rather than shallow gas.
(In the event of a blowout in deep water, the chances of a catastrophe are much less, as currents tend to move the gas away from the rig, before it reaches the surface.)
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But, you are quite correct about ships not floating on gas ..... bearing testament to that, is one D/S "Viking Explorer" lying on the bottom, off the east coast of Kalimantan, Indonesia .....
...... truly, some amazing stories of bravery by crew-members, as a comedy of errors unfolded, in such a devastating emergency.
Jackups too have also foundered off Indonesia, where shallow gas has blown out under the supporting mat, capsizing the rig.
Lots of stories like that emanate from the oilfields to our north .....
happy days
yogi
:)
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