During the pendency of proceedings under section 150—
(a)no seamen or class of seamen or union of seamen shall go or remain on strike or otherwise act in a manner prejudicial to the normal operation of the ships in which the seamen are employed or are likely to be employed; and
(b)no owner of a ship shall—
(i)alter to the prejudice of the seamen concerned in the dispute, the conditions of service applicable to them immediately before the commencement of such proceedings; or
(ii)discharge or punish any seaman in respect of any matter connected with the dispute.