Вот один товарищ на 12 OCH! мне ответил и запостил такую фоту:
ИМХО маленький какой-то, нет? Выглядит как спасательный плотик и уж совсем не похоже на описание "The buoys were fairly large structures consisting of two cylinders one on top of another. The top one serving as the mast and having a doorway leading inside and below into the larger semi-submerged cylinder that served as the shelter and was equipped with the rescue radio and all necessary first aid supplies."