Paragraph 12
Subject to paragraph 13 below, the undertaker shall be responsible for and make good to the Company all costs, charges, damages and expenses not otherwise provided for in this Schedule which may be occasioned to or reasonably incurred by the Company—
by reason of the specified works or the failure thereof, and
by reason of any act or omission of the undertaker or of any persons in their employ or of their contractors or others whilst engaged upon the construction of the specified works,
and the undertaker shall effectively indemnify and hold harmless the Company from and against all claims and demands arising out of or in connection with the construction of the specified works or any such failure, act or omission as aforesaid and the fact that any act or thing may have been done by the Company on behalf of the undertaker or in accordance with approved plans, or in accordance with any requirement of the engineer or under this supervision shall not (if it was done without negligence on the part of the Company or of any person in their employ or of their contractors or agents whilst engaged upon the construction of the specified works) excuse the undertaker from any liability under the provisions of this paragraph.