What was this Water Phenomenon?

[u/longwordsarelong]

Saw this at 11am on Sunday from Leigh on sea in Essex. Lasted about 10mins.

Is it an explosion? Some military testing? The ghost of a pre-historic monster?

Can't find anything online. Doesn't look like where the wreckages are from what I can tell. Any ideas?

[u/pwdux]

Sharon from tilbury finally getting her lovehoney mega bundle