@Tfmonkey Drouge shutes and sea anchors are legitimate devices used in the sailing industry
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@Tfmonkey my first reply got deleted somehow.
"Sink proof" would prob be a stretch. What the chutes do is act as brake to slow down sailing vessels on steep waves. if the bow hits the trough too fast it can submerge and create a dangerous situation.
Sea anchors do exactly as they sound, stop or slow the boat in a current so things like maintenance can be performed.
@marlathetourist @Tfmonkey sink proof would be this
https://youtube.com/shorts/9v3e_E8vH0M?si=lbod0QhZvsJ5dVvj