2022: How much of the Ocean have we explored to date

How much of the Ocean has been explored?
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<blockquote class="wp-embedded-content" data-secret="eaZMAQn8JJ"><a href="https://oceanliteracy.unesco.org/ocean-exploration/">How much of the Ocean has been explored?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://oceanliteracy.unesco.org/ocean-exploration/embed/#?secret=eaZMAQn8JJ" width="600" height="400" title="&#8220;How much of the Ocean has been explored?&#8221; &#8212; Ocean Literacy Portal" data-secret="eaZMAQn8JJ" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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