Mobile Earthquake Recording in Marine Areas by Independent Divers (MERMAID) provides a possibility for long-term and large-scale observation of natural seismic P waves. but it does not have mobility and can only drift with ocean currents. resulting in observation equipment locations that are too sparse or too dense. both of which are not suitable for network observation. https://chefesquipmenters.shop/product-category/tortilla-bowl-makers/