The Germans tried to block completely the exit from the Gulf of Finland by antisubmarine nets and mines.

During the next two days, Salem laid antisubmarine nets to protect the harbor.

Passing over the antisubmarine nets, the troop transports entered the Channel.

She tended antisubmarine nets and performed minesweeping tasks until May 1942.

On 22 February, she passed through the antisubmarine nets and anchored in Seeadler Harbor.

There must be an antisubmarine net across the entrance.

She arrived in Saipan waters on 19 June and began laying antisubmarine net off Tanapag Harbor.

Keokuk arrived off Kerama Retto on 26 March to lay antisubmarine nets prior to the invasion.

In addition to handling the boat, the divers had to practise cutting through antisubmarine nets.

Guard towers rose on either side of the opening; the boom floated on the water's surface but was clearly the support for a heavy antisubmarine net.