Subsea connection of pipeline sections

A connection tool for assembling a pipeline at a seabed location, the tool comprising:

• a frame defining a downwardly opening longitudinal passageway;
• a foundation arranged to fix the frame to the seabed;
• a clamp and a porch supported by the frame, the clamp and the porch being arranged to lock a first pipeline section extending along the passageway, in use, against movement relative to the frame;
• a fixed attachment point configured to anchor an initiation line of a second pipeline section to be landed on the seabed in use, wherein the attachment point is substantially aligned with the clamp and the porch in an upright central longitudinal plane;
• and
• a pull-in system arranged to pull the second pipeline section into end-to-end engagement with the first pipeline section locked by the clamp and the porch;
• wherein the tool is in combination with the second pipeline section, and the initiation line of the second pipeline section is anchored via the attachment point.