A clause in a " hull policy" exempting underwriters from liability under the policy (for damage received as well as damage done) in the event that the insured ship collides with another ship while the vessels are approaching or ranging alongside each other at sea for the purpose of transferring cargo. Cover may be obtained by arrangement with the underwriters, in practice, provided they have notified the intention to transfer cargo in this manner in advance. the exemption does not apply to customary transshipment in port areas involving in shore harbor craft.