Seaweed as a carbon sink

[n.w]

Please forgive my ignorance if this question seems simple. seaweeds cut and sunk to the ocean floor act as a carbon sink, would dead seaweed gathered from the shore and incorporated into soil, have the same effect, like perhaps biochar

 

[gavztheouch]

Not sure, maybe if it was dried and stored it would lock carbon up. Could it be used as insulation, like cellulose insulation which is old magazines and newspapers