Structure with feed through

A method, comprising:

• providing a feed through in a wellhead structure;
• positioning a closing device in the wellhead structure at a location to enable closing of the feed through via the closing device;
• and
• using a temperature-sensitive device to hold the closing device in an open position until a predetermined temperature is reached, the predetermined temperature causing the temperature-sensitive device to initiate closing of the feed through via the closing device.

A method, comprising:

• providing a feed through in a structure;
• routing a communication line through the feed through;
• positioning a closing device in the structure at a location to enable closing of the feed through via the closing device;
• and
• using a condition-sensitive device to initiate actuation of the closing device to sever the communication line and to close the feed through once the condition-sensitive device is sufficiently exposed to a predetermined condition.