Islet currently underwater

The islet was a mangrove ecosystem that suffered significant changes during the last 2 centuries, a study was made based on historical and recent maps which reflects the decrease in total area of the islet from approximately 530000 m² (1807), 340000 m² (1935) and from here a pronounced decrease in the area of the islet until reaching 10260 m² in 2015 and subsequently the total disappearance.
Taking into account the type of terrain in which the mangroves are found: poorly consolidated soils of fine sediments (silt and clay) we could say that everything disappeared due to the action of the waves, and what is left?
Please note: I reviewed Sentinel images from the last 18 months and saw no evidence of the islet in any of them, which leads me to believe that it is completely submerged.