The excessive heat of the upper regions compels him to descend, and he next visits the bottom of the sea in a kind of diving-bell.
The miners work in the bottom in the same manner as divers in an ordinary diving-bell.
He published in 1551 Regola generale per sollevare ogni affondata nave, intitolata la Travagliata Invenzione (an allusion to his personal troubles at Brescia), setting forth a method for raising sunken ships, and describing the diving-bell, then little known in western Europe.
A female diving spider repeatedly carries air to a diving bell made of water-repellent webbing attached to underwater plants.
